Develop Bugs

Question IMEI

Dear all;
I have a question about the Lenovo P2 and the IMEI. I bought a Lenovo P2 from China with a P2a42 Firmware. The phone works perfectly here in Colombia (covers all 2g, 3g and 4g bands) but it was blocked because the Lenovo P2 is not homologated and to do so, it is necessary to show an FDD certificate (which does not exist). So after days of investigating, I just discovered that the only way to make my Lenovo P2 work again here in Colombia is by changing the IMEI. To do that, I have done the next things:
- Unlocked the bootloader
- Installed the TWRP
- Rooted the phone with magic scan
Now, I think I am near to do my lasts steps, but I have not find information about changing the IMEI in this phone. Do you know something about that? is there any chance to do that?
Thank you very much indeed.

How to enable carrier aggregation (LTE+) on Redmi note 5?

Hi!
How to enable carrier aggregation (LTE+) on Redmi note 5 Global? Does it work on Linegae OS?
Best!

CA work by default. I got 4G+ (LTE+) all the time on my RN5P Global

@otonieru
How ? Which bands is it agregating ? I have never seen a 4G+ in my WHYRED"s statusbar
Sent from my whyred using XDA Labs

MikiGry said:
@otonieru
How ? Which bands is it agregating ? I have never seen a 4G+ in my WHYRED"s statusbar
Sent from my whyred using XDA Labs
Click to expand...
Click to collapse
Me too ;(
second question:
what other system can I upload on this phone without bootloader unlucked?

I have the same problem. On order phone i have lte+ but on note i have only lte.
Without u Locke bootloader you can only have oficial roms and devs.
Wysłane z mojego Redmi Note 5 przy użyciu Tapatalka

MikiGry said:
@otonieru
How ? Which bands is it agregating ? I have never seen a 4G+ in my WHYRED"s statusbar
Click to expand...
Click to collapse
see my status bar
it's B40+B40 and B5+B40

@otonieru
So it appears that agregation is somehow limited co certiain bands and therefore works in some countries only :/
Here is Poland B1, B3, B4, B20 and B38 are avaliable. And how did You check which bands is Your phone agegating ?
Sent from my flo using XDA Labs

MikiGry said:
@otonieru
So it appears that agregation is somehow limited co certiain bands and therefore works in some countries only :/
Here is Poland B1, B3, B4, B20 and B38 are avaliable. And how did You check which bands is Your phone agegating ?
Click to expand...
Click to collapse
Network Signal Guru App from Play Store,
and i happen to work in carrier company, so i know which band we are using and how we co figured it

@otonieru
That's a great news
LTE+ was available for You all the time or it just appeared after update ?
I'm asking because somebody tried to enable CA on WHYRED and it was partially succesfull (LTE+ was shown, but CA wasn't working). So now (as CA appears to be working) all that needs to be done is to change in Diag mode which band should be used (to enable CA for different frequencies)
https://forum.xda-developers.com/showpost.php?p=74573146&postcount=3
Sent from my whyred using XDA Labs

MikiGry said:
@otonieru
That's a great news
LTE+ was available for You all the time or it just appeared after update ?
I'm asking because somebody tried to enable CA on WHYRED and it was partially succesfull (LTE+ was shown, but CA wasn't working). So now (as CA appears to be working) all that needs to be done is to change in Diag mode which band should be used (to enable CA for different frequencies)
https://forum.xda-developers.com/showpost.php?p=74573146&postcount=3
Click to expand...
Click to collapse
it's been there since MIUI 9 (time when i bought the phone)
btw, the + sign wont appear to begin with if the band is not aggregated. so i think if u managed to see the sign, the CA should be working

@otonieru
I have never seen a 4G+ sign on my WHYRED Global. My guesses are, that CA is working (as it's working for You), but not with the bands that are avaliable in Poland. In about a month I'm gonna go into USB Diag mode and try to enable something more EU compatible (like B3+B7)
Sent from my whyred using XDA Labs

So i have tried to enable it. I managed to install everything, connect my phone .... But whenever i try to edit NVRAM value it giver error - cant read (no such file ...). I kept left cliking on that value, managed to edit it, rebooted my phone (tried to enable LTE CA on band 1 1+20). No 4G+ though and now QPST wont see my phone anymore :/
Why are those NVRAM values unreadable by QXDM professional and why cant QPST detect my phone (it is visible in device manager as a diagnostic device)
It appears, that those LTE CA items aren"t there. Wird. Is there any way to open a .qnc file to compare two different modems ?
@otonieru @fatnemesis

MikiGry said:
So i have tried to enable it. I managed to install everything, connect my phone .... But whenever i try to edit NVRAM value it giver error - cant read (no such file ...). I kept left cliking on that value, managed to edit it, rebooted my phone (tried to enable LTE CA on band 1 1+20). No 4G+ though and now QPST wont see my phone anymore :/
Why are those NVRAM values unreadable by QXDM professional and why cant QPST detect my phone (it is visible in device manager as a diagnostic device)
It appears, that those LTE CA items aren"t there. Wird. Is there any way to open a .qnc file to compare two different modems ?
@[email protected]
Click to expand...
Click to collapse
you need to make a backup in .xqcn format, and compare it in software like Notepad++
also, it will help to have QRCT tools, not just QPST and QXDM
btw, some values belong to newer modems are no longer readable by older QXDM, you need new version.
no cracked one for that though. You either need to know some qualcomm guys, or work in a company that has access to newer software version (QPDT, QXDM, QRCT. I just happen to be quite lucky to be in the second group.

@otonieru
Yeah. Newer QXDM professional is needed as intra band agreagtion files aren"t readable as well :/
I"ve tried to read something from modem file.qxcn but ... most of it is digits and letters (hexadecimal code i guess)
Can You please check if Yours newer version of QXDM can read LTE CA files ? (they are in NV browser under category RF LTE)
Sent from my whyred using XDA Labs

@otonieru
Can You please check if QXDM 4+ (as this appears to be more up to date LTE capable version) can read LTE CA values ? I would love to now whether downloading cracked QXDM 4 from some dodgy sites and risking installing some nasty malware on my PC is even worth it
Sent from my whyred using XDA Labs

@otonieru
can you share your xqcn file ?

CAN ANYONE PLEASE PROVIDE THE 00028874(LTE BC CONFIG FILE) FILE FOR SDM636 DEVICE ? THANKS IN ADVANCE.

xda.ind said:
CAN ANYONE PLEASE PROVIDE THE 00028874(LTE BC CONFIG FILE) FILE FOR SDM636 DEVICE ? THANKS IN ADVANCE.
Click to expand...
Click to collapse
Rename this into exe and you can generate 00028874 file

Carrier Aggregation Band Combinations

Hi , Where can i find the Carrier Aggregation Band Combinations , for the Redmi Note 8 Pro Global Model ?
For exemple B3+B7+B28 or B1+B7 ....
I know it's 3CA , but there's no info about Band Combinations , inter-band , intra-band ...
About this Carrier Aggregation , is there a difference between global rom and EU rom ?
I just found this : LTE FDD: B1/B2/B3/B4/B5/B7/B8/B20/B28
LTE TDD: B38/B40
but no info on CA .
With Engeneer code *#*#3646633#*#* , i can see bands , but no Carrier Aggregation Band Combinations .

I searched everywhere , but I did not find anything concerning the Carrier Aggregation Band Combinations .
I just found an option to activate CA .

Tengo el mismo inconveniente... B7+B28=4G+ (Chile)
patlemia13 said:
I searched everywhere , but I did not find anything concerning the Carrier Aggregation Band Combinations .
I just found an option to activate CA .
Click to expand...
Click to collapse

Use netmonster app and see yourself which band currently available for in your area

ScarletVeil said:
Use netmonster app and see yourself which band currently available for in your area
Click to expand...
Click to collapse
After many tests, it is obvious that some applications like Netmonster are not always reliable.
The best way to check for the presence of any aggregation is to check with the code *#*#4636#*#*
You have to enable developer mode to use the code: Go to "Settings", "About phone", and click 7 times on "MIUI version" .

Hi
I think we can see carrier Aggregation Band Combinations available on Qualcomm with QPST Flash Tools , QxDM Professional , LTE Band Calculator ...
Is it possible to find the carrier Aggregation Band Combinations available on RN8 Pro Mediatek with Maui Meta , EFT dongle , SP Tool MTK + FlashROM ... ?
Thank you

I have build CA Combo databases, but i don't have Xiaomi Redmi 8 Pro combos. I think closest i have Redmi Note 8 https://cacombos.com/device?model=M1908C3JG or Redmi Note 8T: https://cacombos.com/device?model=M1908C3XG
You can collect these from your device. I have instruction for that: https://mt-tech.fi/en/how-to-get-4g-supported-ca-combinations-from-your-android-phone/ (Check Xiaomi section) Can you then send logs to [email protected] (with your phone model number and provider name) so i can parse these and update combos to my site? If you also have any other device, you can try get CA combos out so we can build together better database.
There is also another database https://smartphonecombo.it/ but there neither have Redmi 8 Pro.

I think RN 8 Pro supports only B1+B3... I have problem with that because it is not enabled B3+B20 in this device. With RN 8T and Mi 9T Pro everything works fine...
With RN 8 Pro (EEA) I don't have nowhere 4G+ (B3+B20). I noticed in very few location that appears for a second 4G+ (B3 1800+).
If I disable B20 in Engineering mode, I get for a short 4G+ (1800 or 1800+1800 or 1800+2100 or 1800+1800+2100). If I disable B3 I get only 4G (but shows 800+1800 or 800+2100 or 1800+1800 or 800+1800+1800 or 800+1800+2100 or 800+1800+1800+2100). So definetely is some problem/ROM bug with B3+B20 in my case.

You are right - it support 1+3 and Intra-CA. I just got device on my hand and i can confirm these bands and combinations are supported: https://cacombos.com/device?model=M1906G7G

I also noticed problem with aggregation on B3+B20. My network provider recently added B1 in my location so aggregation on B1+B3 started to work, bot not at all 3 carriers like in other device. The same problem I had with other Chinese phone, but is was dedicated for Chinese market. I am surprised by such a savings policy in a not the cheapest model.

Question about carrier aggregation, is it possible to copy the LTE NVRAM configuration files from a phone with 4G+ enabled and replace them to another phone with the same chipset that has it's CA disabled using modem odem meta, I have been looking at this files but don't know where to start

Unlock BAND 20 LTE

Hello folks, i need your help to unlock the band 20 of redmi K30 5G. Currently i have Chinese rom installed .
Is a way to unlock the band 20 ? I saw new Xiaomi MI 10, if you change the rom will enable the band 20 . ( in that case is a software limitation)
In our case ?
Thank you !

Nobody can help me ?

Have you tried this method from xda /crossdevice-dev/sony/thread-progress-please-leave-im-updating-t2871269

casimir120 said:
Have you tried this method from xda /crossdevice-dev/sony/thread-progress-please-leave-im-updating-t2871269
Click to expand...
Click to collapse
i dident tried . i dont think to work, is an old version of snapdragon

Let us know if you're making progress... Trying the same thing with a K30 pro.

Any update? Id love to own this phone but need band 20 here in switzerland. Its the only one deactivated that i would need

People tried to unlock bands at the poco F1, but, there was no success, And people tried a lot

I found the possible files causing the restrictions on LTE and 5G bands, but I have no idea how to modify them to unlock bands.
In the policyman folder, the files:
- china_msim_restrictions.xml
- disable_nsa_mmwave_bands.xml
- lte_feature_restrictions.xml
regards
Excuse my writing (I am using Google Translate)

Arielp211 said:
I found the possible files causing the restrictions on LTE and 5G bands, but I have no idea how to modify them to unlock bands.
In the policyman folder, the files:
- china_msim_restrictions.xml
- disable_nsa_mmwave_bands.xml
- lte_feature_restrictions.xml
regards
Excuse my writing (I am using Google Translate)
Click to expand...
Click to collapse
These files doesn't unlock B20 - this is hardware limitation. Bands are configured to nvitems but on 5G phones many things changed.
But could you please share to me your modem log file so i can list all hardware supported 4G bands to my cacombos.com website? I have here instruction how to get log file: https://mt-tech.fi/en/how-to-get-4g...phone/#Method_for_Qualcomm_Devices_after_2020 and you can send it to: https://cacombos.com/contribute . This help me understand what bands & combinations this device support.

costi90 said:
Hello folks, i need your help to unlock the band 20 of redmi K30 5G. Currently i have Chinese rom installed .
Is a way to unlock the band 20 ? I saw new Xiaomi MI 10, if you change the rom will enable the band 20 . ( in that case is a software limitation)
In our case ?
Thank you !
Click to expand...
Click to collapse
If you change any ROMs from global to China and vice versa won't unlock the bands. This is locked down with hardware, not software. Older Qualcomm devices could unlock bands with Qualcomm tools/programs. This isn't the case with newer models.

Question OOS 5G Not Detected.

When i enable 5G using *#*#4636#*#* method it works.
But Oxygen OS won't detect 5G when selecting a network band in settings.
Any fix for this issue? Was on Lineage OS and 5G was working fine and detected but doesn't work when returned to stock Oxygen OS EU.

European version here.
I don't have 5g in Settings > Preferred network type at all.
I read that many people in country's around Europa have problems with 5g.

Only solution for now is to use an app called 5g switch from playstore it creates a shortcut for *#*#4636#*#* instead of dialing it manually.
It's free and has no ads.