Develop Bugs

Restore original carrier software, with multi CSC rom to recover VoLTE

Hi, this is my first post. And im new on this teme of the Multi CSC roms.
I have a question, I get a ROM from SamMobile of my carrier Telcel in Mexico (TCE). I understand that the rom is multi csc, but when I flashed it all the bloatware (that in this case i need, VoLTE is only in my carrier) is from Claro (CHL), and I need it from Telcel. I sent a mail to SamMobile explaining this but they only answered me that the room its ok, the rom is multi CSC.
The CSC version that the system shows me is CHL/CHL/TCE, and I need TCE/TCE/TCE.
Anyone knows what I should do?

From my experience changing firmwares to enable volte, to fully restore csc it's flashing the firmware TCE, download from samfirm app on computer then factory reset from the firmware you have, flash TCE firmware with Odin and this it's the trick you need to have another carrier sim(no telcel) before flash the firmware TCE, wait for boot(don't put an account) when you are on the home screen turn off then enter recovery and factory reset and reboot, here when you swap the Sims, put the telcel sim on it and wait to fully boot and when you see the welcome screen you see a message that say the sim card it's different and need to reset, accept and wait for boot go to settings and check csc and now would be TCE\TCE\TCE

ALUCARD4DEAD said:
From my experience changing firmwares to enable volte, to fully restore csc it's flashing the firmware TCE, download from samfirm app on computer then factory reset from the firmware you have, flash TCE firmware with Odin and this it's the trick you need to have another carrier sim(no telcel) before flash the firmware TCE, wait for boot(don't put an account) when you are on the home screen turn off then enter recovery and factory reset and reboot, here when you swap the Sims, put the telcel sim on it and wait to fully boot and when you see the welcome screen you see a message that say the sim card it's different and need to reset, accept and wait for boot go to settings and check csc and now would be TCE\TCE\TCE
Click to expand...
Click to collapse
Do you really managed to change CSC from one operator (either one) to multi CSC ? And if you do so, can you make a guide for us?

pocos said:
Do you really managed to change CSC from one operator (either one) to multi CSC ? And if you do so, can you make a guide for us?
Click to expand...
Click to collapse
In my quest for fully change the csc without flash twrp and root to lose Knox warranty I ended with some smart guy that say the first two can be changed with flashing firmwares and the last one can only changed with root for that reason if you flash a different firmware region the two changed with the default csc on the multi csc and the last one stay same for example in this case MXO/MXO/TCE and the only way to return all the same it's using other carrier sim card temp until you flash the original firmware and then factory reset and when reboots swap sims putting the original carrier sim card in this particular case telcel

ALUCARD4DEAD said:
From my experience changing firmwares to enable volte, to fully restore csc it's flashing the firmware TCE, download from samfirm app on computer then factory reset from the firmware you have, flash TCE firmware with Odin and this it's the trick you need to have another carrier sim(no telcel) before flash the firmware TCE, wait for boot(don't put an account) when you are on the home screen turn off then enter recovery and factory reset and reboot, here when you swap the Sims, put the telcel sim on it and wait to fully boot and when you see the welcome screen you see a message that say the sim card it's different and need to reset, accept and wait for boot go to settings and check csc and now would be TCE\TCE\TCE
Click to expand...
Click to collapse
Thank you for your answer! But, let me see if I understood.
1- Put a sim from another carrier.
2- Factory Reset.
3- Flash the phone.
4- Turn on, and configure it.
5- Factory reset (again?)
6- Then put the Telcel SIM, before it starts completely
7- And finaly, in the "Welcome" screen, when the phone shows the message of the sim changed, perform another factory reset.
Let me know if I am right,
Right now I don't have another sim, i think that its rare that someone has another carrier But when I have it ill tell you what happenned

pocos said:
Do you really managed to change CSC from one operator (either one) to multi CSC ? And if you do so, can you make a guide for us?
Click to expand...
Click to collapse
al.rale said:
Thank you for your answer! But, let me see if I understood.
1- Put a sim from another carrier.
2- Factory Reset.
3- Flash the phone.
4- Turn on, and configure it.
5- Factory reset (again?)
6- Then put the Telcel SIM, before it starts completely
7- And finaly, in the "Welcome" screen, when the phone shows the message of the sim changed, perform another factory reset.
Let me know if I am right,
Right now I don't have another sim, i think that its rare that someone has another carrier But when I have it ill tell you what happenned
Click to expand...
Click to collapse
Yes basically that's the steps but in the step 5 it's important that you factory reset from recovery

ALUCARD4DEAD said:
Yes basically that's the steps but in the step 5 it's important that you factory reset from recovery
Click to expand...
Click to collapse
Hi,
At step 1 is any SIM or original CSC SIM?

pocos said:
Hi,
At step 1 is any SIM or original CSC SIM?
Click to expand...
Click to collapse
Depends what do you want to do.
In this particular case try to get original CSC TCE/TCE/TCE
He has CH/CH/TCE
If you wanna recover original CSC you need to have another carrier sim on step 1 and when you flash the original firmware go to recovery amd factory reset from there and when you put reboot in the process of boot you swap sims, put the original carrier, firmware sim

ALUCARD4DEAD said:
Depends what do you want to do.
In this particular case try to get original CSC TCE/TCE/TCE
He has CH/CH/TCE
If you wanna recover original CSC you need to have another carrier sim on step 1 and when you flash the original firmware go to recovery amd factory reset from there and when you put reboot in the process of boot you swap sims, put the original carrier, firmware sim
Click to expand...
Click to collapse
Actually I want to move from original CSC to another one!

ALUCARD4DEAD said:
Yes basically that's the steps but in the step 5 it's important that you factory reset from recovery
Click to expand...
Click to collapse
Do you know if the phone must be unlocked? I tried to do it but when I put the other sim, asks me for the carrier unlock code. The phone doesn't show me the message of the sim changed.
I've been some research and I found that Claro is Telcel in the rest of America Latina. Maybe its the reason that shows me Claro.
I tried the CSC secret code *#272*IMEI# and nothing happens, how i know if a ROM would let me do this?

pocos said:
Actually I want to move from original CSC to another one!
Click to expand...
Click to collapse
For that only flashing another firmware if you are from Mexico could you install MXO firmware it's the generic Mexican clean version and that you get MXO/MXO/TCE
The last one remains TCE this only can be change with root.
al.rale said:
Do you know if the phone must be unlocked? I tried to do it but when I put the other sim, asks me for the carrier unlock code. The phone doesn't show me the message of the sim changed.
I've been some research and I found that Claro is Telcel in the rest of America Latina. Maybe its the reason that shows me Claro.
I tried the CSC secret code *#272*IMEI# and nothing happens, how i know if a ROM would let me do this?
Click to expand...
Click to collapse
I don't try it with locked device, I think yes you needed unlocked, and yes claro it's from telcel what you have on your csc?

ALUCARD4DEAD said:
For that only flashing another firmware if you are from Mexico could you install MXO firmware it's the generic Mexican clean version and that you get MXO/MXO/TCE
The last one remains TCE this only can be change with root.
I don't try it with locked device, I think yes you needed unlocked, and yes claro it's from telcel what you have on your csc?
Click to expand...
Click to collapse
Actually I have the MXO/MXO/TCE, i've tried with the TCE rom, but still showing Claro. And these two roms doesn't allow the csc secret code. Don't you know what rom allows the csc secret code? I don't wanna try multiple roms from sammobile the download speeds are frustrating.

al.rale said:
Actually I have the MXO/MXO/TCE, i've tried with the TCE rom, but still showing Claro. And these two roms doesn't allow the csc secret code. Don't you know what rom allows the csc secret code? I don't wanna try multiple roms from sammobile the download speeds are frustrating.
Click to expand...
Click to collapse
Did you find anything? i have the same problem as you... when i dial the code, nothing happens i've tried on the ZTO, MXO and TCE

al.rale said:
Actually I have the MXO/MXO/TCE, i've tried with the TCE rom, but still showing Claro. And these two roms doesn't allow the csc secret code. Don't you know what rom allows the csc secret code? I don't wanna try multiple roms from sammobile the download speeds are frustrating.
Click to expand...
Click to collapse
Try download from samfirm it's more fastest download the full firmware it's pc exe.
Do you try the step mention above? With other sim factory reset from recovery and swap sims, when phone boots tells you the sim change and need to reset and then you get TCE/TCE/TCE

ALUCARD4DEAD said:
Try download from samfirm it's more fastest download the full firmware it's pc exe.
Do you try the step mention above? With other sim factory reset from recovery and swap sims, when phone boots tells you the sim change and need to reset and then you get TCE/TCE/TCE
Click to expand...
Click to collapse
Wow thank you! Im downloading it right now at 2.2 mb/s, compared with 100 kb/s of sammobile.
I tried anything and nothing works, I think that the unique solution is try with another OWA roms, I don't know if Telcel and Claro SIM's have similar identifiers and thats why returns me to Claro. Don't you know if there are roms with the csc menu activated?

TonyGzl92 said:
Did you find anything? i have the same problem as you... when i dial the code, nothing happens i've tried on the ZTO, MXO and TCE
Click to expand...
Click to collapse
Nope, do you think that the carrier lock relates with the problem?
Which sim carrier did you try?
Could I have problems if I try ATT or Movistar roms?

al.rale said:
Nope, do you think that the carrier lock relates with the problem?
Which sim carrier did you try?
Could I have problems if I try ATT or Movistar roms?
Click to expand...
Click to collapse
My phone was originally from att but I unlocked it and now use it on telcel and I want to use VoLTE with telcel. I would like to try the att or movistar firmwares but the problem is that (for what I've read) since the last att update was from like March the bootloader is older (v1) compared to telcel or MXO (v2) so you can't downgrade.
What carrier are you using? And what do you want it to be?

TonyGzl92 said:
My phone was originally from att but I unlocked it and now use it on telcel and I want to use VoLTE with telcel. I would like to try the att or movistar firmwares but the problem is that (for what I've read) since the last att update was from like March the bootloader is older (v1) compared to telcel or MXO (v2) so you can't downgrade.
What carrier are you using? And what do you want it to be?
Click to expand...
Click to collapse
As far I know to get VoLTE on telcel you need to buy phone directly with them, because uses the imei to enable that function
---------- Post added at 11:01 PM ---------- Previous post was at 10:59 PM ----------
al.rale said:
Wow thank you! Im downloading it right now at 2.2 mb/s, compared with 100 kb/s of sammobile.
I tried anything and nothing works, I think that the unique solution is try with another OWA roms, I don't know if Telcel and Claro SIM's have similar identifiers and thats why returns me to Claro. Don't you know if there are roms with the csc menu activated?
Click to expand...
Click to collapse
What firmware you already try?

ALUCARD4DEAD said:
As far I know to get VoLTE on telcel you need to buy phone directly with them, because uses the imei to enable that function
Click to expand...
Click to collapse
Yes, I thought so too, but the thing is I went to Telcel and asked and the told me that my phone SHOULD have VoLTE but I think that may be associated with my phone number, (since I've had that number for a long time), and not with the IMEI

[GUIDE]: G975F - Flashing megathread + FAQs

Since the official firmware thread by @henklbr is flooded with posts asking how to flash rather than actual firmware update talk, this thread can be used for that instead.
Here's the Odin flashing guide at the beginning of the thread which nobody will read.
How to flash the stock Odin flashable firmware:
1) Download Odin v3.13.1 - Link
2) Extract the firmware file you just downloaded. You should get 5 files:
AP (System & Recovery)
BL (Bootloader)
CP (Modem / Radio)
CSC_OXM (OXM CSC file, will wipe your phone)
HOME_CSC_OXM (OXM CSC file, will NOT wipe your phone)
3) Add each file to it's respective field in Odin v3.13.1. Use CSC_OXM if you want to do a clean flash and HOME_CSC OXM if you want to keep your apps and data.
4) Reboot your phone in Download / Odin mode:
-Power off your Galaxy S10/S10+
-Connect the cable to your PC, but do not plug it into your phone yet
-Hold Volume Down + Bixby button and plug the Type C cable into your phone while holding down those buttons
-You will get a warning on your screen, press 'Continue'
5) Once in download mode, Odin should detect your device and a blue box will show up with the COM port number.
6) Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot and they are enabled by default.
7) Click the start button, wait for Odin to say 'PASS'. Once the flash is complete, your phone will reboot automatically.
Flashing Tips:
1) Always try to use the OEM Samsung USB-C cable when flashing.
2) Install Samsung Smart Switch before flashing, it automatically installs the latest Samsung USB drivers. However, make sure Smart Switch is CLOSED when you are flashing your device with Odin.
3) Try not to have too many other applications running if you have a PC with low RAM as Odin can consume a lot of memory sometimes, and the last thing you need is for your PC to freeze in the middle of a flash.
This is what a successful flash log on Odin looks like for an S10+ ----> Pastebin Link
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Before asking a question below, read the FAQs, your question has most probably already been answered.
Q1) Will this trip KNOX, and will I lose my warranty?
Short answer: No
Detailed answer: KNOX counter will remain at 0x0 and warranty stays valid as well.
However, some service centers might note regional differences between builds based on the latest build available for your CSC, indicating that the phone has been flashed, so if you're sending your device in for a service/repair/replacement, then I'd suggest flashing to the latest build available for your home country's CSC. Usually not required though, so not a big deal.
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Q2) What if the firmware build number mentioned above is not available for my CSC, can I still flash it?
Short answer: Yes, but that is subject to your current active CSC. Read detailed answer below.
Detailed answer: See this list --- > LINK
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Q3) I flashed 'ASxx' build, but now I can't get OTAs for a newer build that's available on my CSC?
Short answer: The build you are currently running on your device was never released for your CSC, so no subsequent OTA file is available on the server.
Detailed answer: This is due to Samsung's stupid update rollout methods. Go to SamMobile, select SM-G975F and find your region in the list, and flash whatever the latest build is to regain the ability to receive OTAs.
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Q4) Can I flash the ROM in the main post without flashing the builds that came before it?
Short answer: Yes.
Detailed answer: The firmwares available for download using SamFirm or Frija are full firmware files. Flashing them will manually flash (and update, if necessary) every partition on your phone. So you could be on the oldest firmware ever released for the S10+, and flash directly to the latest one without having to flash any builds released in between.
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Q5) Can I flash without wiping my data?
Short answer: Yes.
Detailed answer: If you've gotten to this question, you clearly haven't read the Odin flashing instructions.
If you want to flash and retain all the data on your phone, you can choose to use the HOME_CSC file when flashing. This will only upgrade your phone to the newer firmware, but allow you to keep all your data.
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Q6) I am on a carrier firmware, can I flash this firmware?
Short answer: Yes, but all your data will be erased.
Detailed answer: If you are on a carrier firmware that is not part of the OXM multi-CSC list given in the answer for Q2, then you can still flash OXM firmwares, but you will not have the option of using the HOME_CSC file to retain your data. You must wipe your data when switching from a carrier firmware to an unbranded firmware. Once you are on the unbranded OXM firmware, you can use HOME_CSC to upgrade without wiping data.
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Q7) If I flash AUT region firmware on my DBT device, will it affect my ability to get OTA updates?
Short answer: Maybe, maybe not.
Detailed answer: Read the answer of Q3.
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Q8) Is there any risk of flashing?
Short answer:No, not really.
Detailed answer: If you are not experienced with flashing but would still like to flash your phone, make sure to be very very careful and don't miss any steps in the process. There is usually no risk, and it is very hard to permanently brick your device when flashing stock ROMs. There is a chance of data loss if the flash is interrupted.
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Q9) Why does the window says 'FAIL' instead of PASS?
Short answer: Could be for multiple reasons, see detailed answer.
Detailed answer: If a flash fails, always make sure to copy and paste your Odin log here so we can see where and why the flash failed.
The Odin flash log can be seen on the bottom left of the Odin window, see this screenshot ---> Odin 3.13.1 screenshot
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Q10) Why does the Odin log show that the flash failed at sboot.bin.lz4?
Short answer: The version of your Odin is not compatible with newer firmwares that use lz4 compression.
Detailed answer: Samsung started using .lz4 compression with Oreo firmwares, so older versions of Odin can't be used.
Use Odin v3.13.1 (Download link) for flashing on the S10+.
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Q11) Why does the Odin flash log show FAIL (XmitDataWrite)?
Short answer: There was an issue flashing the AP (System) file to your device. Read detailed answer on how to solve.
Detailed answer: This is usually due to an issue with the USB port or the cable being used to flash the device. If you are using a USB 3.0 port on your PC / laptop, try switching to a USB 2.0 port instead. If you don't have a USB 2.0 port available, change the cable. Some cables don't handle large file transfers well. Preferably use the OEM Samsung cable that you got in the box of your phone.
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Q12) Where can I download the latest S10+ (SM-G975F) firmwares?
Answer: You can use Frija which downloads the firmwares straight from Samsung servers - Link
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Q13) What do the CSCs in the settings menu mean?
Answer: See below.
Single SIM device:
If you have a Single SIM device, it will show 3 CSCs in the settings menu, in the following format:
DBT/DBT/DBT
1st CSC = active CSC (You will get OTAs for this CSC and any features like Samsung Pay, VoLTE, WiFi calling are dependent on the active CSC)
2nd CSC = CSC of your SIM card (In case your SIM card is from a different region than your active CSC, this will be different from the active CSC)
3rd CSC = Hardware CSC of your device (For example, you purchased the device in Germany, but are living in the Netherlands, it will show PHN/PHN/DBT)
It is not possible to change the hardware CSC, and it has 0 effect on the device's functionality or when it will get OTA updates. It is simply an indicator for what market the device was intended for sale in.
Dual SIM device:
If you have a Dual SIM device, it will show 4 CSCs in the settings menu, in the following format:
DBT/DBT,DBT/DBT
1st CSC = active CSC (You will get OTAs for this CSC and any features like Samsung Pay, VoLTE, WiFi calling are dependent on the active CSC)
2nd CSC = CSC of your SIM card (In case your SIM card is from a different region than your active CSC, this will be different from the active CSC)
3rd CSC = CSC of your SIM card in SIM slot 2
4th CSC = Hardware CSC of your device (For example, you purchased the device in Germany, but are living in the Netherlands, it will show PHN/PHN,PHN/DBT)
It is not possible to change the hardware CSC, and it has 0 effect on the device's functionality or when it will get OTA updates. It is simply an indicator for what market the device was intended for sale in.
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Q14) Why did my CSC change to XEF (France) after flashing from a carrier ROM to the unlocked ROM?
Answer: For OXM firmwares on the S10 series, when flashing from a non-OXM ROM (such as a carrier ROM) to an OXM multi-CSC ROM, the active CSC defaults to XEF.
Detailed answer: For devices that are region locked, once you flash from carrier to unlocked, it will stay on XEF. There is no way to change CSC yet without root.
For devices that are not region locked, it will change to XEF, but to switch to the unlocked CSC for your region, remove your SIM card, insert it again and do a factory reset from the settings menu.
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Q15) Can I downgrade to an older build?
Answer: It depends on your current build. Sometimes you can downgrade, sometimes you can not. Read detailed answer to check.
Detailed answer:
You have to see the bootloader version of your current build. Samsung tends to upgrade bootloader versions regularly so downgrading is not always possible.
For example if your current build is G975FXXU3ASG8, and you want to downgrade to G975FXXU2ASF3, it will not be possible.
Moving from 'XXU3' to 'XXU2' is not possible since XXU2 is an older bootloader version, and because of Samsung's downgrade protection, it will not allow the older version to be flashed.
When attempting to flash, Odin will show 'FAIL' in the flash window, and the bootloader screen on your device will display this error:
SW REV CHECK FAIL(BOOTLOADER) DEVICE: 3, BINARY: 2
This is showing that the device is currently on a v3 build, and the build being flashed is v2, so it will reject the file and abort the flash immediately.
If however you want to downgrade from G975FXXU3ASG8 to G975FXXU3ASG2, you are free to do so, since both builds are labeled 'XXU3' and are on the same bootloader version (i.e: v3).
Note: Some builds will be labeled 'XXS', and the same reasoning applies to those builds as well. If the bootloader version is different, you can not downgrade.
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Q16) Why are some builds labeled 'XXU', whereas some builds are labeled 'XXS'?
Answer:
XXU builds are usually larger updates, they usually include security patches, kernel changes and other under the hood fixes. When new features are added, they are also usually shipped with 'XXU' builds.
XXS builds are maintenance releases. They just include security patches and nothing more. OTA sizes for XXS builds are usually significantly smaller as well. In some cases, exceptions can be made and new kernels can be included with XXS builds as well.
These changes are usually discussed in the stock firmware thread for the device.
For newly released devices in the first 6-8 months, almost all builds are XXU since Samsung is actively working on improving the device.
For devices nearing EOL, Samsung is only fulfilling its obligation to provide security patches and no new features, so most builds are XXS.
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First! Just installed ASE7 (AUT) over ASE6 (BTU) using HOME_CSC (I was already on BTU). Very nice it is like real OTA because bloatware wasn't installed. Phone working...
additional info: My S10 (not +) was branded in Czech T-Mobile TMZ/TMZ,TMZ/TMZ now is BTU/BTU,BTU/TMZ and all is good. Still obserwing stuff around Samsung

Flashing for dummies guide is very useful. Thanks

To keep root when flashing new firmware, you patch the AP file in Magisk then use that patched .tar file in the AP slot in odin, right?

vibrantliker said:
To keep root when flashing new firmware, you patch the AP file in Magisk then use that patched .tar file in the AP slot in odin, right?
Click to expand...
Click to collapse
I haven't rooted my phone, but have read about it, and yes that seems to be the way to go about it.
Lots of people complaining that they have to patch the entire 5 GB AP file.

The list of CSCs included in the OXM multi-CSC has now been updated for the Galaxy S10/S10+.
Link is in the main post, and here as well:
https://drive.google.com/open?id=1PPPo1DhdVAIJDha6kEmIDE4UxyxtEsBHqONlE81QvEc

Hi there,
My OPS (OPTUS) Is a multi CSC carrier but since I do not longer use it in Australia but rather in South America,I would like to change my CSC to perhaps DBT so I can get the latest OTA updates.
Is it possible to change my CSC?
I use the Claro SIM here and I have successfully updated the AS7 firmware.
Thanks.

Cancerbero04 said:
Hi there,
My OPS (OPTUS) Is a multi CSC carrier but since I do not longer use it in Australia but rather in South America,I would like to change my CSC to perhaps DBT so I can get the latest OTA updates.
Is it possible to change my CSC?
I use the Claro SIM here and I have successfully updated the AS7 firmware.
Thanks.
Click to expand...
Click to collapse
Your device seems to be region locked to OPS which is why it isn't offering automatic CSC change.
I need to experiment with the complicated CSC change method on my own S10+ first and then I'll post it here.

My S10+ has the active CSC code as TTT, the device doesn't receive OTA software updates and I notice your listing has TTT as N/A, would this be why I haven't received the OTA updates? I've flashed the latest ones manually. I've tried to change the CSC by flashing XEF, BTU, SKR, TPA and EON as I'm from Trinidad, but nothing has changed the CSC, all my other Samsung devices, including my other S10+ has the active CSC as TPA and they receive updates. All are unlocked and have sims from the same carrier. Any ideas as to how to change it to get OTA updates?

Gdefreitas said:
My S10+ has the active CSC code as TTT, the device doesn't receive OTA software updates and I notice your listing has TTT as N/A, would this be why I haven't received the OTA updates? I've flashed the latest ones manually. I've tried to change the CSC by flashing XEF, BTU, SKR, TPA and EON as I'm from Trinidad, but nothing has changed the CSC, all my other Samsung devices, including my other S10+ has the active CSC as TPA and they receive updates. All are unlocked and have sims from the same carrier. Any ideas as to how to change it to get OTA updates?
Click to expand...
Click to collapse
Did you buy the device from a carrier, or unlocked?
I've got TTT listed as N/A since I wasn't aware which country / carrier it belonged to.

MeltdownSpectre said:
Did you buy the device from a carrier, or unlocked?
I've got TTT listed as N/A since I wasn't aware which country / carrier it belonged to.
Click to expand...
Click to collapse
It's an unlocked device that's purchased from a retailer, I'm not sure where their supplier is located, my guess would be Panama. TTT is Trinidad and Tobago, I'm from Trinidad, but instead of my device CSC being TPA like the other devices that gets the update, mine is TTT/TTT, TTT/TPA. I just would like to change it to TPA to be able to get updates, or even EON which is the CSC for firmwares for Trinidad.

Gdefreitas said:
It's an unlocked device that's purchased from a retailer, I'm not sure where their supplier is located, my guess would be Panama. TTT is Trinidad and Tobago, I'm from Trinidad, but instead of my device CSC being TPA like the other devices that gets the update, mine is TTT/TTT, TTT/TPA. I just would like to change it to TPA to be able to get updates, or even EON which is the CSC for firmwares for Trinidad.
Click to expand...
Click to collapse
What carrier are you using in Trinidad?
Maybe TTT is for a specific carrier, and since that's part of OXM, your phone automatically selects that CSC.
Although it is very weird that the FOTA server doesn't list any OTAs for TTT, which means you'll have to flash every update manually.

MeltdownSpectre said:
What carrier are you using in Trinidad?
Maybe TTT is for a specific carrier, and since that's part of OXM, your phone automatically selects that CSC.
Although it is very weird that the FOTA server doesn't list any OTAs for TTT, which means you'll have to flash every update manually.
Click to expand...
Click to collapse
I'm using Bmobile, which is the carrier all my other devices use as well, and they show the CSC as TPA, so they receive the updates. Their is no TTT firmware for the S10+, but there is for the S10. I assumed that would mean no firmware updates, and I only received one, but that was when I now purchased the phone, after that I had to factory reset the phone and since then, I haven't gotten any OTAs. Is there anyway to change the CSC to TPA? I've tried flashing the other firmwares, the BTU, XEF, SKR, but none of them changed the CSC from TTT. Any suggestions?

Gdefreitas said:
I'm using Bmobile, which is the carrier all my other devices use as well, and they show the CSC as TPA, so they receive the updates. Their is no TTT firmware for the S10+, but there is for the S10. I assumed that would mean no firmware updates, and I only received one, but that was when I now purchased the phone, after that I had to factory reset the phone and since then, I haven't gotten any OTAs. Is there anyway to change the CSC to TPA? I've tried flashing the other firmwares, the BTU, XEF, SKR, but none of them changed the CSC from TTT. Any suggestions?
Click to expand...
Click to collapse
Can you try swapping the SIM card from another phone of yours to the S10+?
After inserting the SIM card, restart the phone and check what it shows under settings > about > software information > service provider SW Ver.

MeltdownSpectre said:
Can you try swapping the SIM card from another phone of yours to the S10+?
After inserting the SIM card, restart the phone and check what it shows under settings > about > software information > service provider SW Ver.
Click to expand...
Click to collapse
I've tried that, even tried from the other carrier available in my country, but it still doesn't change. It remains as TTT. It's the dual sim version, although I've never even inserted a second sim into it, that slot shows TTT as well.

MeltdownSpectre said:
Can you try swapping the SIM card from another phone of yours to the S10+?
After inserting the SIM card, restart the phone and check what it shows under settings > about > software information > service provider SW Ver.
Click to expand...
Click to collapse
I saw another one of your posts where it mentioned using RealTerm to change the CSC, can this be used with my device, and if so, how do I go about doing it? Thanks for any assistance you may be able to render.

Gdefreitas said:
I saw another one of your posts where it mentioned using RealTerm to change the CSC, can this be used with my device, and if so, how do I go about doing it? Thanks for any assistance you may be able to render.
Click to expand...
Click to collapse
In theory the RealTerm method should work just fine. All you'll need is a combination / factory binary file for the G975F. The rest of the tutorial should work the same way.
I think I have the file, I'll check and upload it later today.

MeltdownSpectre said:
In theory the RealTerm method should work just fine. All you'll need is a combination / factory binary file for the G975F. The rest of the tutorial should work the same way.
I think I have the file, I'll check and upload it later today.
Click to expand...
Click to collapse
OK, thanks a lot, I'll give it a try. Just for the sake of knowing, could you explain what exactly the combination file is, and does it work on any software version of the device, or is it firmware specific? In other words, will it work on the ASE7 build that I'm presently on? Also, will I continue to get OTA updates after switching the CSC this way?

Gdefreitas said:
OK, thanks a lot, I'll give it a try. Just for the sake of knowing, could you explain what exactly the combination file is, and does it work on any software version of the device, or is it firmware specific? In other words, will it work on the ASE7 build that I'm presently on? Also, will I continue to get OTA updates after switching the CSC this way?
Click to expand...
Click to collapse
Combination or factory binary is the file used in Samsung factories and service centers to program phones before sale or return to the customer.
It does work as long as the Bootloader revision is the same. If you are on the May update or older, it will work just fine.
You flash it with Odin like you would a normal ROM, and it will boot up with very limited functionality. Then follow the RealTerm tutorial and set the CSC to whatever you'd like.
If it's TPA, then once you're done changing the CSC, flash your device to the ASE7 May build and let it boot up, go through the setup wizard and it should say TPA/TPA,TPA/TPA.
Once you've confirmed that TPA is the active CSC, then you're good to go. Everything will work normally and you will get OTA updates as well.
I'm uploading the factory binary now, but since I don't recommend publicly posting the link, I'll PM it to you once it's done.

Hey guys, sorry if this has been asked and answered a thousand times but I'm a bit paranoid after doing the research and as this is a my new phone I don't want to do anything wrong.
I bought a carrier locked S10+ with MOB CSC, A1 carrier in Austria. The phone is now carrier unlocked and on latest MOB firmware which is May 1. sec. lvl. I want to flash the lastest released MULTI-CSC G975FXXU2ASF3 firmware from the firmware thread. As the phone is new and I didn't even set it up I planned to flash with CSC_OXM. From my understanding the phone will change to the SIMs CSC after the flash. Am I correct?
Am I able to do this as planned or is it not possible to flash MULTI-CSC over my MOB-CSC? Will I be able to receive OTA updates or do I need to flash everytime with ODIN after CSC change? Thanks in advance!

flashing the unbranded KOO csc on my korean G960N device still shows KTC bloatware

I have a Korean G960N device that has a lot of KT carrier bloatware, so I decided to flash a KOO unbranded Korean firmware, however even after flashing is successful the device still shows KT logo, bloatware, and several KT-related options in the 'Settings' app, as well as KTC in the "about device" option. how do I get rid of this ****.

Coomer91 said:
I have a Korean G960N device that has a lot of KT carrier bloatware, so I decided to flash a KOO unbranded Korean firmware, however even after flashing is successful the device still shows KT logo, bloatware, and several KT-related options in the 'Settings' app, as well as KTC in the "about device" option. how do I get rid of this ****.
Click to expand...
Click to collapse
flash the CSC not the HOME_CSC. The CSC file will factory reset it and remove any remnants of the previous carrier info including bootanimation, splash screen etc etc

Youdoofus said:
flash the CSC not the HOME_CSC. The CSC file will factory reset it and remove any remnants of the previous carrier info including bootanimation, splash screen etc etc
Click to expand...
Click to collapse
I know, and I did, and still shows KTC bloat including logo. I saw other people posting about the problem in other samsung device forums but didn't find an explanation. I wish there was a unified forum for these general samsung issues, so that they'll get the largest amount of attention possible.

Coomer91 said:
I know, and I did, and still shows KTC bloat including logo. I saw other people posting about the problem in other samsung device forums but didn't find an explanation. I wish there was a unified forum for these general samsung issues, so that they'll get the largest amount of attention possible.
Click to expand...
Click to collapse
can you grab a multi csc and flash it without the sim card in it?

Youdoofus said:
can you grab a multi csc and flash it without the sim card in it?
Click to expand...
Click to collapse
lel, I've been trying to flash an international firmware for 6 months now without success, it's always some damn PIT error, tried everything Patched Odin, with PIT file, without PIT file, with NAND erase, without NAND erase, EVERYTHING, and none of it works, and no one on the internet confirmed that flashing an international G960F firmware on a Korean G960N device actually succeeds. just check my post history to see all the posts I made about the issue.

Coomer91 said:
lel, I've been trying to flash an international firmware for 6 months now without success, it's always some damn PIT error, tried everything Patched Odin, with PIT file, without PIT file, with NAND erase, without NAND erase, EVERYTHING, and none of it works, and no one on the internet confirmed that flashing an international G960F firmware on a Korean G960N device actually succeeds. just check my post history to see all the posts I made about the issue.
Click to expand...
Click to collapse
doesnt surprise me that the F firmware worked on a N device at all. Both are Exynos chipsets, so there isnt really a reason for it to not work. 6 months you say? @AthieN have any ideas?

Youdoofus said:
doesnt surprise me that the F firmware worked on a N device at all. Both are Exynos chipsets, so there isnt really a reason for it to not work. 6 months you say? @AthieN have any ideas?
Click to expand...
Click to collapse
Either the firmware being flashed is mislabeled, or it's not truly flashing. I've seen where Odin says it was successful, but not really... That could be a whole different set of reasons why it's not working though.
My suggestion is re-download the firmware, from a trusted source and try again.

i'm having the same issue as the first post , i have a s10e sm-g970n and it's on sk telecom carrier sh*** , it doesn't want to dissapear even by using the KOO firmware (G970NKSU3BSKO) it's driving me crazy ! this was already in KOO firmware before i tried the custom recovery and custom rom and all , now i just want to go STOCK and this isn't willing to install a stock version without sk telesh*** without bloot ... anyone can help me ?

225franc said:
i'm having the same issue as the first post , i have a s10e sm-g970n and it's on sk telecom carrier sh*** , it doesn't want to dissapear even by using the KOO firmware (G970NKSU3BSKO) it's driving me crazy ! this was already in KOO firmware before i tried the custom recovery and custom rom and all , now i just want to go STOCK and this isn't willing to install a stock version without sk telesh*** without bloot ... anyone can help me ?
Click to expand...
Click to collapse
often times the phone is being told what carrier youre on by the sim card, then if the phone has that carriers CSC in its internal database (in the case of multi-CSC firmware sets) the phone will recognize the carrier and then install the carrier specific crap. I use the U1 firmware and dont have any of the carrier junk that it originally came with. I got it on a Cricket offer and very quickly got rid of all the Cricket junk by flashing the U1 firmware

I successfully changed CSC to KOO on my G960N after it was SKT to do that i had to
- root the device
- install phone info app
- use the tool to change csc
You will have a choice of 4 CSCs choose KOO and install
PS : backup data as it will be erased

numpea said:
I successfully changed CSC to KOO on my G960N after it was SKT to do that i had to
- root the device
- install phone info app
- use the tool to change csc
You will have a choice of 4 CSCs choose KOO and install
PS : backup data as it will be erased
Click to expand...
Click to collapse
Thanks again for this help bro , i already forgot about the csc code changing , only thing who were annoying to me were the SKC blootware and bootanimation
i succefully uninstalled the blootware after rooting and using root uninstaller pro , then about the bootanimation i couldn't find any way to change (even by changing files into system/media/ ) , so i just left it
but good thing you gave us the steps , maybe it will help one guy who is willing to change his CSC code

225franc said:
Thanks again for this help bro , i already forgot about the csc code changing , only thing who were annoying to me were the SKC blootware and bootanimation
i succefully uninstalled the blootware after rooting and using root uninstaller pro , then about the bootanimation i couldn't find any way to change (even by changing files into system/media/ ) , so i just left it
but good thing you gave us the steps , maybe it will help one guy who is willing to change his CSC code
Click to expand...
Click to collapse
When you change the csc code to KOO it will be as an european model the bootanimation will normal and the settings page will be as normal as it can be without korean trach

numpea said:
When you change the csc code to KOO it will be as an european model the bootanimation will normal and the settings page will be as normal as it can be without korean trach
Click to expand...
Click to collapse
Will i loose the magisk root if i change the csc code ?
Also can TWRP be installed when Magisk is there ?

225franc said:
Will i loose the magisk root if i change the csc code ?
Also can TWRP be installed when Magisk is there ?
Click to expand...
Click to collapse
Do a backup with twrp when you change csc it will erase data and you will loose magisk all you have to do is go back to recovery and restore the backup ( backup only data )
Twrpcan always be installed with odin with or without magisk

Alright bro , thx again for the help !

Hello everyone. So I have a S20 Ultra SM-G988N. Its a Korean variant with a Snapdragon Chipset. It has the option OEM unlock and all so the device is rooted. I also was able to change my CSC without doing a data wipe...
What I did was go into the root of the phone into /ets/imei/mps_code.dat. I opened that file with text editor. For me it came up empty so I added the text "KOO" with a different text editor because the one provided by my Root Explorer wasn't letting me edit it. Once I added that in I restarted my phone. My phone started up, had the regular Samsung Logo. But if course some of the blostware is there.
My big issue is the phone connects to Korean things as in some apps will say my Region is Korean. For example my Weather widget (Samsung App) would only let me pick location by state, or country. I can't choose the town I live in nor does the app knows my correct location. It would say I'm in Bethpage Korea.
So my question is because the SM-G988N has a Snapdragon Chipset, would I be able to Flash an U1 Variant Home CSC Using Odin? This way I have multiple CSCs which I can then use to debloat and get the phone to be like US Version.

Coomer91 said:
I have a Korean G960N device that has a lot of KT carrier bloatware, so I decided to flash a KOO unbranded Korean firmware, however even after flashing is successful the device still shows KT logo, bloatware, and several KT-related options in the 'Settings' app, as well as KTC in the "about device" option. how do I get rid of this ****.
Click to expand...
Click to collapse
hi do you know where i can download that firmware which shows KT logo i searched everywhere but i couldn't find always shows SKC

numpea said:
I successfully changed CSC to KOO on my G960N after it was SKT to do that i had to
- root the device
- install phone info app
- use the tool to change csc
You will have a choice of 4 CSCs choose KOO and install
PS : backup data as it will be erased
Click to expand...
Click to collapse
Thank you for your share. I did the same process as you, but in the phone info app, when i select "Change CSC" it deliver this message: Try opening secret code... then nothing shows up. I'm glad if you could help
THanks

BChamp said:
Hello everyone. So I have a S20 Ultra SM-G988N. Its a Korean variant with a Snapdragon Chipset. It has the option OEM unlock and all so the device is rooted. I also was able to change my CSC without doing a data wipe...
What I did was go into the root of the phone into /ets/imei/mps_code.dat. I opened that file with text editor. For me it came up empty so I added the text "KOO" with a different text editor because the one provided by my Root Explorer wasn't letting me edit it. Once I added that in I restarted my phone. My phone started up, had the regular Samsung Logo. But if course some of the blostware is there.
My big issue is the phone connects to Korean things as in some apps will say my Region is Korean. For example my Weather widget (Samsung App) would only let me pick location by state, or country. I can't choose the town I live in nor does the app knows my correct location. It would say I'm in Bethpage Korea.
So my question is because the SM-G988N has a Snapdragon Chipset, would I be able to Flash an U1 Variant Home CSC Using Odin? This way I have multiple CSCs which I can then use to debloat and get the phone to be like US Version.
Click to expand...
Click to collapse
yes it works, I did the same on an S20FE Korean version, Root + unlock BL needed though.

saoudien07 said:
yes it works, I did the same on an S20FE Korean version, Root + unlock BL needed though.
Click to expand...
Click to collapse
if i want to flash in KOO Flash pack, is it necessary to unlock bootloader and root? Is there any way to be able to root without losing Samsung Knox?

Question A52s Carrier Bloatware / Clean FIRMWARE

I've been messing around with few firmwares out there but none are unbranded, so I'm here asking for a solution to get rid of annoying unnecesary bloatware, no rooting if it's possible. Maybe someone already have found a good unbranded firmware that I can use to flash my A52s? Thanks.

Samsung nowadays uses multi CSC packs (OMC), so it's most likely you've been flashing the same firmware over and over. You need to de-brand your phone by changing your CSC, you can use SamFw since it doesn't requires root and will not blow your warranty bit

BlackMesa123 said:
Samsung nowadays uses multi CSC packs (OMC), so it's most likely you've been flashing the same firmware over and over. You need to de-brand your phone by changing your CSC, you can use SamFw since it doesn't requires root and will not blow your warranty bit
Click to expand...
Click to collapse
Stuck in Latinamerica, and my CSC code is OWO, I believe that ain't multi, tried the UUSD code on Samsung and Google phone apps but not working. I checked every CSC so I don't end up flashing unnecesarily. I'm gonna flash some nordic firm that I read is unbranded, wish me luck, hope I don't end up with a brick.

ekam95 said:
Stuck in Latinamerica, and my CSC code is OWO, I believe that ain't multi, tried the UUSD code on Samsung and Google phone apps but not working. I checked every CSC so I don't end up flashing unnecesarily. I'm gonna flash some nordic firm that I read is unbranded, wish me luck, hope I don't end up with a brick.
Click to expand...
Click to collapse
Flashing the firmware for your country's CSC alone is not enough, as I said you need a tool like SamFw to change the sales code set in the efs partition of your phone (without it, root would be required to modify those files).

BlackMesa123 said:
Flashing the firmware for your country's CSC alone is not enough, as I said you need a tool like SamFw to change the sales code set in the efs partition of your phone (without it, root would be required to modify those files).
Click to expand...
Click to collapse
How come I didn't notice the CSC change function on SamFW tool? I just change it with it and now is all clean as expected (debranded), thank you! So grateful!

Question AT&T G990U2 to T-Mobile or unbranded firmware help needed

I would appreciate if anyone can point me to the right direction. I have 21FE G990U2 from AT&T, It is unlocked by AT&T.
All I need is working T-Mobile firmware or Samsung (no carrier branding) to flash. I tried multiple versions of U, U1 and U3 firmwares (all matching my current Binary -4) but no success.
I just would like to get rid of ATT bloat. I know I can uninstall it via ADB but I rather have firmware clean of it.
Any suggestion please?
Thanks

So am I right to assume that you are looking for a G990U2 TMB firmware with Binary 4, to flash on a G990U2 AT&T phone?
If so, then you can download it from the below link by clicking on "Download Samfw server" (G990U2OYN4EWC3, April 2023 update):
Download Galaxy S21 FE 5G SM-G990U2 (TMB) G990U2SQS4EWC3 in Samfw - Samsung firmware download
Galaxy S21 FE 5G SM-G990U2 (TMB - United States) G990U2SQS4EWC3 T(Android 13) samsung firmware download all model, lastest, fast update, completely free and fast speed in Samfw.com ✅
samfw.com
or if I am assuming wrong, can you please correct my understanding? As I do not have any practical hands-on experience with the USA models.

Shuhan44 said:
So am I right to assume that you are looking for a G990U2 TMB firmware with Binary 4, to flash on a G990U2 AT&T phone?
If so, then you can download it from the below link directly (G990U2OYN4EWC3, April 2023 update):
https://02-samsung.cloud/v2/IxJCDiMnLh8SLAo5IRtBAzwDMyMyCB4lFzssIDs2ByAzMUEgOzEUQDMQMCMBOyw/LiUzJjIXCDkuJC8/NDseIy8xIQYzOAIlPDAVHRIvMz81CAIkMwsuOB42FA00Nh4LNS8vFjIXLA0NFzE/PAMeOTMADTkDAC4mNBEaMCExQQEhJQUUHjFCMTs4BkIjCyI/Iws8MQEWCDAeCw0xCREHOTQbIyshAD4OIQAGLC44Hiw0ER4OMiUzLDIlDSs8AD4fJhsGOg8HCkA8AywnCRc+Di8LBxAzBy4RDxYpKTwkHjUeBylCJgceKTIXIUAJER4OMi8+AwMSMBsBAzY5LwNBJi8IMAQ4MTQUAQMgLyMsHjM7JDMHLzEjJDgAISk8PxQ9NTggQiYbLyUhJCEpMjsHJzw2KSceFy4QIzEvKw8WIAYhFh4JMjAeLDQsLCM0Gy45IzgGQiMDPB0jJCI/ARYFMCMiExM=
or if I am assuming wrong, can you please correct my understanding? As I do not have any practical hands-on experience with the USA models.
Click to expand...
Click to collapse
You are correct - I need T-Mobile (or carrier free) so I can utilize full carrier settings.
Thanks for the link, however above link gives an error when opening the page.
Nevertheless I will look for TMB firmware with CSC: G990U2OYN4EWC3 and post an update here

Flashed that and still has AT&T boot logo and all the apps

h078 said:
Flashed that and still has AT&T boot logo and all the apps
Click to expand...
Click to collapse
Well, I am sure that you have flashed by a Factory reset (Flashed CSC, not Home CSC in ODIN). The boot logo can be changed by rooting your device, also bloatware apps can be deleted via ADB command without rooting.. but you already have mentioned that you prefer not to proceed with those processes. So I am out of suggestions, sorry.
Just for my knowledge, after flashing the TMB firmware, now your settings> About phone> software information> service provider software version: 2nd line shows as TMB/ TMB/ AT&T?
(Also corrected the download link in my previous comment anyway).

Yes, you are correct i did flash CSC, not home CSC. Then I reflashed w home CSC but software still says ATT/ATT/ATT.
Moreover on Bootloader screen says "carrier ATT" - I have never seen that before on any Samsung phone that I had. I have no clue how did they lock up device that well. As for removing software via ADB that is not a problem, but ATT locks network selection mode so you cant choose between 5G, LTE, 3G etc..
TMobile in US still supports EDGE and sometimes it comes handy - whereas ATT has only LTE and 5G as they re-farmed EDGE and 3G/HSPA frequencies

h078 said:
Yes, you are correct i did flash CSC, not home CSC. Then I reflashed w home CSC but software still says ATT/ATT/ATT.
Moreover on Bootloader screen says "carrier ATT" - I have never seen that before on any Samsung phone that I had. I have no clue how did they lock up device that well. As for removing software via ADB that is not a problem, but ATT locks network selection mode so you cant choose between 5G, LTE, 3G etc..
TMobile in US still supports EDGE and sometimes it comes handy - whereas ATT has only LTE and 5G as they re-farmed EDGE and 3G/HSPA frequencies
Click to expand...
Click to collapse
I do not get why the CSC can never be changed, even after flashing the complete firmware... must be an ATT thing!
Anyway, to change the csc only, there is another very quick & easy method. It takes only 2/3 minutes; no flash or factory reset is required. You have to download and install a small software "SamFW Tool" on your pc/laptop (may need to disable the antivirus during the download/install process). Once done, connect the phone and enable USB debugging mode. Open the software, under the ADB tab, click Change CSC, from the dropdown list select TMB and click Change. The phone will restart and CSC "Should" change to TMB/TMB/ATT.
Here is the download link for the software:
https://www.mediafire.com/file/upaiwadhmstm6js/SamFwToolSetup_v4.6.zip/file

That did the trick. I have T-Mobile CSC now
Thanks a lot

h078 said:
That did the trick. I have T-Mobile CSC now
Thanks a lot
Click to expand...
Click to collapse
Great!
But still, that's only one part of the final solution I think. Your target was to replace the complete firmware from ATT to TMB, right? Since the CSC is now changed to TMB, I think you can give it another try via ODIN to install the TMB firmware now (only if you want). I am not confident that it will work now, but still, one last try should not be much of a hassle.

I think that these multi CSC contain all US carrier customizations....When I changed it to TMB it shows TMB/TMB/ATT and loads bootlogo as well as TMobile apps... I guess it is similar as Blackberry used to be back in the days...Depending which carrier SIM used it loaded proper settings from the firmware...

I have flash my METROPCS G990U2 to G990U3,other sim card work fine,but t mobile sim card does not work ,can someone help me?I already change CSC to xxa,but still no internet,I do have sginal bar​