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[GUIDE] Restore Bootloader Bricked S3 to Stock Firmware AFTER 4.3 update. No Jtag

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mrspock08
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Thumbs up Restoring bootloader to bricked S3 T999L

Quote:
Originally Posted by TronMinecraft View Post
Here I hope to outline how I restored my T999 Tmobile S3 to stock firmware after the 4.3 MJC update, and after bootloader bricking the phone. I do assume you are capable of using ADB, ODIN and TWRP. I believe this method will work for other S3 models, but I have no ability to test it. If it will work, firmware and debrick IMGs will have to be found for the specific device. The T999 firmware and IMGs will NOT work with other devices. This will restore to stock UVUEMJC 4.3 firmware. Will not be rooted, but existing 4.3 roots for the device should work.
Great guide, thanks a ton to @TronMinecraft for this writeup! I've been lucky and haven't bricked my S3 T999L (the T-Mobile LTE variant), but a relative wasn't so lucky. She took the OTA upgrade and when she wasn't happy with the result tried to just restore to her old 4.1.2 backup. Needless to say she bricked her phone.

So, I can confirm that this method DOES work on a T999L. However, there are a couple of things to note (these should be no-brainers, but in the interest of saving questions from the newbies out there...) Of course like Tron said, I take no responsibility for damage to your device should you try this. I can only tell you that it worked fine for me. Here's the things to watch out for, listed by the steps in the OP:

4. Make certain that you use the correct PIT file for the T999L. The proper PIT file for the T999L is the one DocHoliday uploaded here http://forum.xda-developers.com/show...1848267&page=3. Do not use the regular T999 PIT file from @invisiblek's first post in that thread, which is what was linked to in the OP.

5. Make sure you use the correct firmware for the T999L, NOT the T999. If you're trying to recover from a brick then most likely you're going to want the Original UVAMB7 firmware (JB 4.1.2), since it seems most bricks lately are caused by trying to downgrade after flashing the 4.3 update. Of course if you want to you can also flash the UVUBMK4 (4.3) firmware and get the complete stock 4.3 system, including the bootloader, KNOX, etc.

However, if you're just recovering from a brick and want 4.3 I would recommend not just flashing the UVUBMK4 firmware directly. Rather, I would flash the older UVAMB7 firmware, and then once your phone is back up and running flash DocHoliday77's UVUBMK4 4.3 Rooted, deodexed_KnoxFREE ROM from http://forum.xda-developers.com/show...370981&page=58. Once you've done that, just flash the updated modem from http://forum.xda-developers.com/show....php?t=1880987 as needed. This way you end up with the full rooted version of the 4.3 firmware but without the 4.3 bootloader which includes KNOX and causes so many problems with downgrading.

Of course that's just my two cents. I've been running my S3 with DocHoliday's stock UVUBMK4, KnoxFree, rooted ROM with the UVAMB7 bootloader and UVUBMK4 radio for over a month now and haven't had any problems. As always, your mileage may vary.
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TronMinecraft
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Quote:
Originally Posted by mrspock08 View Post
Great guide, thanks a ton to @TronMinecraft for this writeup! I've been lucky and haven't bricked my S3 T999L (the T-Mobile LTE variant), but a relative wasn't so lucky. She took the OTA upgrade and when she wasn't happy with the result tried to just restore to her old 4.1.2 backup. Needless to say she bricked her phone.

So, I can confirm that this method DOES work on a T999L. However, there are a couple of things to note....
Thank you for confirming this worked for somebody else. I'm working on a slightly re-factored version of this based on input, and I'll be sure to note your findings about the T999L. Thanks!
 
TronMinecraft
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Originally Posted by SignalX View Post
so what?
i want to update my phone to T999UVUEMJC 4.3 firmware
currently i'm on T999UVDMD5 4.1.2
is it safe to update using Odin?

sorry for noob question

This really isn't quite the right place for such a question. A search will yield you great results.

But yes, there's no reason you couldn't if you're sure you have the right firmware for your GS3 model. However if you simply want a stock update, I'd just use the OTA update function, or kies. Its a bit safer than manually messing with Odin, and won't void your warranty.
 
nikDR
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Very useful thread. Bricking is actually a lot easier than I thought.
 
FINNIX1996K
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hi does this guide help downgrade a 4.3 without loosing imei ? thank you
hope to receive a answer to this noob question

Sent from my SGH-T999 using XDA Premium 4 mobile app
 
Adreaver
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Originally Posted by FINNIX1996K View Post
hi does this guide help downgrade a 4.3 without loosing imei ? thank you
hope to receive a answer to this noob question

Sent from my SGH-T999 using XDA Premium 4 mobile app
You CAN NOT DOWNGRADE 4.3.

This guide is to unbrick you and return you to 4.3 if you tried to downgrade (which won't work, ever).

Sent from my SGH-T999 using XDA Premium 4 mobile app
Phone: T-Mobile Samsung Galaxy SIII LTE SGH-T999L (White)
Android Version: 4.3 Jellybean
Rom: PAC-manNightlies (9/5)
Kernel: DKP 3.4 (9/2)
Modem: T999LUVAMB7
Tweaks: ComaDose v2.1
Apps: Slim Gapps
 
TronMinecraft
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(Last edited by TronMinecraft; 25th February 2014 at 07:02 AM.)
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Actually, from my own experimentation you were right, you can in fact downgrade from 4.3. You just can't flash a rom that tries to change the bootloader. You cannot downgrade the 4.3 bootloader; but there isn't any reason why you can't run an earlier version of android.


I am currently running 4.2.2 rootbox AFTER having having done the official 4.3 update.
I did this with TWRP, and a rootbox flashable zip.
 
Adreaver
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Quote:
Originally Posted by TronMinecraft View Post
Actually, from my own experimentation you were right, you can in fact downgrade from 4.3. You just can't flash a rom that tries to change the bootloader. You cannot downgrade the 4.3 bootloader; but there isn't any reason why you can't run an earlier version of android.


I am currently running 4.2.2 rootbox AFTER having having done the official 4.3 update.
I did this with TWRP, and a rootbox flashable zip.
You did not downgrade. You flashed a custom ROM.

An example of downgrading would be a user on md5 flashing ljc with Odin. This puts bootloader, ROM, kernel, and baseband exactly as Samsung intended when LJC was released.

Sent from my Cleared Out T999L on CM11
Phone: T-Mobile Samsung Galaxy SIII LTE SGH-T999L (White)
Android Version: 4.3 Jellybean
Rom: PAC-manNightlies (9/5)
Kernel: DKP 3.4 (9/2)
Modem: T999LUVAMB7
Tweaks: ComaDose v2.1
Apps: Slim Gapps
 
SoulEater-
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Should be pinned. Very useful indeed
 
TronMinecraft
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Quote:
Originally Posted by Adreaver View Post
You did not downgrade. You flashed a custom ROM.

An example of downgrading would be a user on md5 flashing ljc with Odin. This puts bootloader, ROM, kernel, and baseband exactly as Samsung intended when LJC was released.

Sent from my Cleared Out T999L on CM11


Okay, thank you for the clarification. I was incorrectly applying the term downgrade.

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