[Q] Stock 4.4.2 on i9192: mobile signature not working - Galaxy S 4 Mini Q&A, Help & Troubleshooting

Hello,
I have a Samsung S4 mini duos. I am not sure where it was purchased, probably UK or DE.
I updated it to stock 4.4.2 from sammobile. Tried several firmwares, but WiFi was not working. These are not working: Sri lanka, Russia, New zealand. The only one I managed to support Wifi was this Panama ROM:
http://www.sammobile.com/firmwares/download/40033/I9192UBUCNG2_I9192UUBCNG2_TPA.zip/
I have also used CSC to set it to SEB (baltics).
Now everything is working fine more or less (battery life is bad on 3G, good on 2G), however I am unable to get mobile signature working. It was working fine on stock rooted 4.2.2. The card is inserted to SIM2, it is working properly: sending messages, calling, receiving calls. However, whenever I try to use mobile signature, I am asked by SMS toolkit (I guess) to check my data. When I click OK, it says ERROR DF 19 00.
My operator says this error is related to phone's software (I have tried it on other phone and it works). Anyone knows what is happening and how do I fix this?
Also are there any other stock roms available, closer to baltic states or UK/DE at least? Maybe Panama has some weird GSM settings.
And why does WiFi not work with other roms, like Russian?
Current version information is attached bellow.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Fix
elektrinis said:
Hello,
I have a Samsung S4 mini duos. I am not sure where it was purchased, probably UK or DE.
I updated it to stock 4.4.2 from sammobile. Tried several firmwares, but WiFi was not working. These are not working: Sri lanka, Russia, New zealand. The only one I managed to support Wifi was this Panama ROM:
http://www.sammobile.com/firmwares/download/40033/I9192UBUCNG2_I9192UUBCNG2_TPA.zip/
I have also used CSC to set it to SEB (baltics).
Now everything is working fine more or less (battery life is bad on 3G, good on 2G), however I am unable to get mobile signature working. It was working fine on stock rooted 4.2.2. The card is inserted to SIM2, it is working properly: sending messages, calling, receiving calls. However, whenever I try to use mobile signature, I am asked by SMS toolkit (I guess) to check my data. When I click OK, it says ERROR DF 19 00.
My operator says this error is related to phone's software (I have tried it on other phone and it works). Anyone knows what is happening and how do I fix this?
Also are there any other stock roms available, closer to baltic states or UK/DE at least? Maybe Panama has some weird GSM settings.
And why does WiFi not work with other roms, like Russian?
Current version information is attached bellow.
Click to expand...
Click to collapse
Hi dude i pass for the same problem and the only you have to do is reflash the rom throu odin, for example i flash once the russian one and i did not have wifi working the first time, so i reflash it again and "voila" wifi start working,
look you can flash this rom http://forum.xda-developers.com/galaxy-s4-mini/development/s5-s4-mini-t2987500 via recovery and see if its work for you, use philz recovery to flash it, and in the installation process there will be a part where your select you CSC, and of course this rom have a very good battery improves Gl mate!

Flash rusian firmware until the baseband change
Power off phone using power key a menu
Restart in Odin mode using combo keys power home vol down
Flash firmware in ap
Let it boot and check if has changed

it is strange, but shutting down before flashing actually helped right away.
So now I am running stock russian (EN menu) firmware, however mobile signature is still not working.
Anyone familiar with SIM toolkit errors? Error DF 02 00 or DF 19 00.
Is there a log somewhere?

Related

[stock rom][2.3.6][MULTI-LANG] P1000XWJQ8_P1000PHNJQ1_P1000XXJPZ

Hi friends,
if you want "the latest" stock firmware (2.3.6) for you device,
just check through fus check here
There are several sale codes available now (1st Feb. 2012)
DBT, o2 Germany, Dutch, GB, ....
so have a look there, ok??!
It is for P1000 GSM/3G only!
From what I have seen, it is fully multi-language ROM.
XX = de,en,es,fr,hu,it,nl,pt(cs,da,el,fi,no,pl,sl,sv,tr) languages
It is amazing fast, stable and has the same new lock screen like JQ3/JQ4.
It has new keyboard layout (=anyhow new to me!) and no bugs or soft reboots so far.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
It's for GSM ?
Thanks for share !
Just flashed it. Yes it's for gsm, dutch and confirmed 2.3.6.
Also Noticed this one is much faster and better response.
Thanks for sharing
Can I root it with CF-Root-TAB7_XX_OXA_JQ1-v3.3-CWM3RFS ?
I have used it for 2.3.5 and successful !
Thanks!
howto root it?
Does 3G and Wi Fi work?
Camera issues?
Thank you
how to install?
pmse said:
Does 3G and Wi Fi work?
Camera issues?
Thank you
Click to expand...
Click to collapse
3G works like a charme. 3.2 mbit down- and 1.4 mbit upload rate.
Calls in 3G perform perfect. Everybody can hear each other loud and clearly with and without bt headset.
By the way: BT works as it should with my plantronics bt headset.
Wifi (5 GHz und 2.4GHz band both) perform fine.
GPS fix is fast as out of nowhere. Impressive.
Camera is bugfree, video recording works as it alway did - perfect.
Energy consumption seems to be normal to long lasting but I will watch over the weekend and can report proper test experiences earliest on next Monday.
ehm, stupid question, but can I install this on a not-rooted device?
Starting from a BOCA 2.3.7 rom, I successfully flashed this one:
- restocking via Odin with the safe GB rom provided by Team Overcome; and then
- flashing via Odin the TAR file.
I'm just trying to cope with the keyboard: the tab standard keyboard does not seem to work (every letter is displayed as "null") and swype is not installed. I will try wil a different one...
Thanks for sharing and download link.. I just installed Overcame 4.0.0 a few days ago and it's working very nice and now this.. (I hate to install on Tab every little bit something, but my Galaxy S - is different story )
Anyway thanks again for link..
i try to root with CF3.3 : NOK :-(
CF ROOT 3.3 : NOK
ZergRush de SuperOneClick : NOK (Ok for 2.3.3, but NOK on 2.3.6)
New links
New links for original firmware from Kies
http://www.multiupload.com/1IP9CCCJQB
Thol said:
i try to root with CF3.3 : NOK :-(
CF ROOT 3.3 : NOK
ZergRush de SuperOneClick : NOK (Ok for 2.3.3, but NOK on 2.3.6)
Click to expand...
Click to collapse
I successfully flashed "CF-Root-TAB7_XX_OXA_JQ1-v3.3-CWM3RFS" using Odin and rooted the tab...
How to
guildamx said:
I successfully flashed "CF-Root-TAB7_XX_OXA_JQ1-v3.3-CWM3RFS" using Odin and rooted the tab...
Click to expand...
Click to collapse
How to flash ROM with odin, thank for your reponse.
Works
Works for me, danish lang for the system but NO danish xt9 lang.!!
I just Install the .TAR via odin3.
Now i have some netherlands programs indstall to.
Maybe not the best .TAR file for us in Denmark.
I updated 2.3.5 and this ROM 2.3.6 and I have a problem with Samsung Keyboard (Default Keyboard).
When I type a word, it became "NULL"
Ex: mai => nullnullnull
How can I fix it ?
Thanks!
could anyone please check RTL languages support? (persian, arabic...)
thanks
maihuuquan said:
I updated 2.3.5 and this ROM 2.3.6 and I have a problem with Samsung Keyboard (Default Keyboard).
When I type a word, it became "NULL"
Ex: mai => nullnullnull
How can I fix it ?
Thanks!
Click to expand...
Click to collapse
I had this problem with another ROM. I think changing to another keyboard and then changing back again resolved it or rebooting, can't remember which at the moment

Cannot find correct Stock rom

So my signal wouldn't work so I went to SamMobile and downloaded the UK BTU stock ROM. I wiped the rom used triangle away to reset flash counter and installed the stock ROM. The status was 'Normal'. I then sent it to Samsung for a repair.
I received the phone back yesterday, samsung have refused to repair it as it has custom firmware, I have again installed the UK BTU firmware (old versions too) and it seems to be installing a Ukrainian stock ROM, no matter which website I download it from.
The signal is now working but I still cannot find the actual UK BTU (or UK T-Mobile) stock ROM.
Also, when I received the phone back from samsung the auto-rotate feature no longer works (Android Sensor Box shows it not working at all) and I cannot say this to Samsung as they will obviously think i'm making it up.
Anyway, can anyone help ?
Thanks
CuBz90 said:
Anyway, can anyone help ?
Thanks
Click to expand...
Click to collapse
Here is the link to Stock Roms http://forum.xda-developers.com/showpost.php?p=31801046&postcount=1
Find the correct Rom and install it ,
Check if you Imie number displays or if its Null ?
aukhan said:
Here is the link to Stock Roms http://forum.xda-developers.com/showpost.php?p=31801046&postcount=1
Find the correct Rom and install it ,
Check if you Imie number displays or if its Null ?
Click to expand...
Click to collapse
I have tried that link and getting an incorrect ROM. First of all the language is Ukranian (I believe) even though it is listed as United Kingdom BTU. The flash counter goes back to 1 at every boot even though I am not rooted and Kies refuses to install firmware.
My IMEI displays fine.
open kies - tools - firmware upgrade and initialization
You need to enter S/N , you can find in device setting / back of device under battery.
CuBz90 said:
So my signal wouldn't work so I went to SamMobile and downloaded the UK BTU stock ROM. I wiped the rom used triangle away to reset flash counter and installed the stock ROM. The status was 'Normal'. I then sent it to Samsung for a repair.
I received the phone back yesterday, samsung have refused to repair it as it has custom firmware, I have again installed the UK BTU firmware (old versions too) and it seems to be installing a Ukrainian stock ROM, no matter which website I download it from.
The signal is now working but I still cannot find the actual UK BTU (or UK T-Mobile) stock ROM.
Also, when I received the phone back from samsung the auto-rotate feature no longer works (Android Sensor Box shows it not working at all) and I cannot say this to Samsung as they will obviously think i'm making it up.
Anyway, can anyone help ?
Thanks
Click to expand...
Click to collapse
Hi,
Do you have the n7105 LTE model?
T-Mobile UK is now known as Everything Everywhere.
The ROMs show on SamMobile as "United Kingdom (EE)" and have EVR as the CSC
like: http://www.hotfile.com/dl/197072816/008698a/N7105XXDMB2_N7105EVRDMA2_EVR.zip.html
dr.ketan said:
open kies - tools - firmware upgrade and initialization
You need to enter S/N , you can find in device setting / back of device under battery.
Click to expand...
Click to collapse
Tried that, keep getting error "Error found in the downloaded file". I've tried updating Kies, removing and re-installing and i still get the same error everytime.
Pyr0x64 said:
Hi,
Do you have the n7105 LTE model?
T-Mobile UK is now known as Everything Everywhere.
The ROMs show on SamMobile as "United Kingdom (EE)" and have EVR as the CSC
like: http://www.hotfile.com/dl/197072816/008698a/N7105XXDMB2_N7105EVRDMA2_EVR.zip.html
Click to expand...
Click to collapse
It is definitely N7100, it's with T-Mobile (EE) but not on their "4gee" plan. The stock firmware is BTU.
Here is the details i'm shown after entering my S/N:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I fixed it myself by checking "Phone" instead of "PDA" in Odin. This also fixed the orientation problem.
Thanks anyway.

[Q] Can't make calls on 4G.

I have a I9195 with stock 4.4.2. I know 4G is for data only but when my phone connects to 4G (it had a full signal) it drops my 3G connection so I am unable to make calls or send and receive text messages. Is this normal?
After 2 or 3 attempts trying to make a phone call, it switched back to 3G I had a full signal and I was able to make calls but now I don't have 4G internet access. I'm in a 4G area, my sim card supports 4G so does my tariff.
thecf said:
I have a I9195 with stock 4.4.2. I know 4G is for data only but when my phone connects to 4G (it had a full signal) it drops my 3G connection so I am unable to make calls or send and receive text messages. Is this normal?
After 2 or 3 attempts trying to make a phone call, it switched back to 3G I had a full signal and I was able to make calls but now I don't have 4G internet access. I'm in a 4G area, my sim card supports 4G so does my tariff.
Click to expand...
Click to collapse
100% modem \ RIL issue ... try to flash the modem of your country or the closest
I can't go back to 4.2.2. It didn't work on the UK firmware also. I tried I9195XXUBML4_I9195YTUBNA2_I9195XXUBML4_HOME.tar.md5 before I upgraded to 4.4.2.
Can anyone help with this? It use to do the same on my S4 as well with the same sim card. Maybe 4G isn't enabled on my account?
thecf said:
Can anyone help with this? It use to do the same on my S4 as well with the same sim card. Maybe 4G isn't enabled on my account?
Click to expand...
Click to collapse
mate flash the nearest countrey modem of kitkat using odin in "cp" 2 times .. first without auto-reboot and after flashing reboot to download again and this time in cp again with auto reboot and let it boot .. im sure it will be better ... just remember nearest modem
How?
I'm currently using I9195XXUCNH5_I9195OXXCNI1_XEF.zip from SamMobile. I flashed it with Odin. It is the very latest firmware but it was for France's sim free market.
If you look at the firmware list on SamMobile, for the UK there is only 4.2.2. I have 4.4.2 installed. I've tried flashing 4.2.2 again but It won't revert back.
I tried putting the modem.img or modem.bin file in I9195XXUCNH5_I9195OXXCNI1_XEF.tar.md5 using tar and md5sum but it didn't work. I need a linux box to do that because the windows version of tar and md5sum are different and don't support the parameters I need to pass.
So how do I flash with the latest modem for the UK market?
rrgrrg said:
mate flash the nearest countrey modem of kitkat using odin in "cp" 2 times .. first without auto-reboot and after flashing reboot to download again and this time in cp again with auto reboot and let it boot .. im sure it will be better ... just remember nearest modem
Click to expand...
Click to collapse
Can someone remove the boot stuff from I9195XXUBML4_I9195BTUBNA1_BTU.zip so I can flash back to 4.2.2?
Because I9195UBUBNE2_I9195ZTOBNE2_ZTO.zip is 4.2.2 and that flashed successfully but it is for the Brazil market.
But I9195XXUBML4_I9195BTUBNA1_BTU.zip will not flash even if I have 4.2.2 installed. It's something to do with the boot files. I read somewhere you can take them out the tar file, re-package it and 4.2.2 will work again on the S4 mini LTE.
I have tried different Modems but it is still not working. It tries to connect to 4G but is never successful, so it reverts back to 3G. I don't think it is a problem with the phone as it use to do the same thing on my brand new S4.
I think it is a problem with the sim card or the Three network. But how do I find out? Anyway I have attached a screenshot so you can see what is happening. As you can see, my phone is trying to connect to 4G, in the process my phone drops the 3G connection. So I can never have 4G + 3G running side by side.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
rrgrrg said:
mate flash the nearest countrey modem of kitkat using odin in "cp" 2 times .. first without auto-reboot and after flashing reboot to download again and this time in cp again with auto reboot and let it boot .. im sure it will be better ... just remember nearest modem
Click to expand...
Click to collapse

No Network after upgrading Samsung galaxy note 4 SM-910P from android 5.1 to 6.0

I have a galaxy note 4 SM-N910P, i'm living in Morocco, When i flash this version of android N910PVPU4COG5 android 5.1 the networks works fine, but when i upgrade to official android 6.0 it shows emergency call only.
It seems to phone is unlocked, i don't know what to do right now!
any help? please, thank you in advance
I have a solution. Open your phone dialer and type this code
##72786# and press the dial button and the phone should restart. I live in India and when I upgraded from Kitkat (custom rom) to Stock Marshamallow, I also lost the network. But after trying the above method, I got the network when the phone restarted. Hope this helps you. BTW I am on a GSM SIM.
nateuc3 said:
I have a solution. Open your phone dialer and type this code
##72786# and press the dial button and the phone should restart. I live in India and when I upgraded from Kitkat (custom rom) to Stock Marshamallow, I also lost the network. But after trying the above method, I got the network when the phone restarted. Hope this helps you. BTW I am on a GSM SIM.
Click to expand...
Click to collapse
it works maaaan, big big big thanks to you :good::good:
Always glad to help a fellow user
My so called 910F ( actually 910p) having the same prob.
I purchased the phone SM-N910F in Bangladesh but actually it was refurbished SM-N910P rooted and masked as 910F with a stock software. However, I have flashed it with the stock rom N910PVPU4COG5_N910PSPT4COG5_N910PVPU4COG5_HOME.tar.md5 it worked fine. It started then OTA update and when updated to 6.0.1 android ver. it lost network. I input the command as above (##72786#). Now network is working but network bar is showing empty and now the set is working as digital roaming and roaming sign (r) is showing with the network bar.
However, thanks for the help, it least the phone is working.
iqbal2910 said:
I purchased the phone SM-N910F in Bangladesh but actually it was refurbished SM-N910P rooted and masked as 910F with a stock software. However, I have flashed it with the stock rom N910PVPU4COG5_N910PSPT4COG5_N910PVPU4COG5_HOME.tar.md5 it worked fine. It started then OTA update and when updated to 6.0.1 android ver. it lost network. I input the command as above (##72786#). Now network is working but network bar is showing empty and now the set is working as digital roaming and roaming sign (r) is showing with the network bar.
However, thanks for the help, it least the phone is working.
Click to expand...
Click to collapse
Same problem here
nateuc3 said:
I have a solution. Open your phone dialer and type this code
##72786# and press the dial button and the phone should restart. I live in India and when I upgraded from Kitkat (custom rom) to Stock Marshamallow, I also lost the network. But after trying the above method, I got the network when the phone restarted. Hope this helps you. BTW I am on a GSM SIM.
Click to expand...
Click to collapse
THANK YOU !!!!! From ARGENTINA :laugh::laugh::good:
---------- Post added at 02:13 AM ---------- Previous post was at 01:59 AM ----------
ok, now it works for calls but not for messages. and i don't know why the "networks operators" is grayed out. ??? :C
ALSO I can't SEND messages. I can only do calls and receive messages.
I checked the option MESSAGE CENTER but it dissapeared . And some other peoplease have it grayed out.
Any solution to this ??
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Softbricked my S20+ 5G SM-G986U - Need Help!

Hello Guys,
I have SM-G986U Samsung Galaxy S20+ 5G Snapdragon. I had Android 10 and I did not receive any update of Android 11, so I tried flashing it to Android 11 One UI 3.0 my self.
I couldnt correctly figure out what my CSC was, but my phone was of US origin and unbranded unlocked. So i downloaded stock ROM for G986U1 - XAA (CSC) - Android 11 https://samfw.com/firmware/SM-G986U1/XAA/G986U1UES1CTL5 ( i read in a thread that G986U can be flashed with G986U1)
First i had problem flashing it with Odin 3.13.1, which did not work. Then i read somewhere i should try patched version. So i tried Odin 3.13 (patched), Odin 3.14, Odin 3.14.1 (patched).
It started flashing with Odin 3.14.1 patched, but after started i stucked on flashing "super.img" and then it softbricked. I tried FRP Hijacker to try recovering, but it said "re-download official super.img".
Then i tried some other firmwares. I tried
1. G986U1 - XAA (CSC) - Android 11
2. G986U1 - XAA (CSC) - Android 10
3. G986U - TMB (CSC) - Android 10 (because I had exactly same AP version and CSC version in my phone when it was working, i checked that with *#1234#. AP VERSION 986USQU1ATAW , CSC VERSION G986UOYN1ATAW)
4. G986U - SPR (CSC) - Android 11 (Because when i went to download mode for the first time, i saw at the left top of my screen something like Carrier_id = SPR. So i have tried this as well)
It stucks here:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I have run out of options now, need help. Please let me know what should i try to fix my phone. The only screen i come to now is "An error has occured while updating the device software. Use the Emergency recovery function in the Smart Switch PC Software"
I tried using Smart Switch Emergency Recovery as well, it doesn't show my phone in the list where i should select. It looks like a connection problem with Smart Switch.
I have tried everything i could. I dont know if i am trying the wrong firmwares or something wrong with the Odin. I NEED HELP TO RESTORE MY DEVICE. PLEASE.
EDIT:
I have now explored Samsung has disabled this feature in Smart Switch, i even tried older version which had this feature Smart Switch 4.0 and 4.1, it had device initialization option, where i was able to search the model and enter S/N but then it just closes.
So the hopes are down with Smart Switch.Looks like only way out is Odin, but don't what i am mistaking. Is it the right firmware selection or need some trick with the Odin.
Thank God, it is fixed now. I couldnt understand a lot. I figured my CSC was "OYN" and it is Multi CSC phone unbranded phone. I tried again to flash with G986U - TMB (CSC) - Android 10 (which had AP VERSION 986USQU1ATAW , CSC VERSION G986UOYN1ATAW ). It stuck again on flashing prism.img. So i tried again dropping the CSC file and flashed AP, BL and CP files. Which worked but my phone was still not starting since it was missing the Prism.img.
So i then tried flashing the CSC file with the other firmware version which i previously downloaded for "XAA (CSC)" which is also for unbranded USA. And it worked. The phone started working back now. Though in updates section it now says "Your current software version isnt supported". But the phone works fine so far.
Links that helped in understanding:
https://forum.xda-developers.com/t/carrier-firmware.4114373/
https://www.sammobile.com/forum/threads/46490-Galaxy-S20-Ultra-(SM-G988U)-Multi-CSC-Flash-Help/page2
Thank you!
May i ask how do you unlock the bootloader?

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