Chainfire ( XDA renowned rom tweakers ) has done it again. Working together with Rotohammer they have now managed to break the protected bootloaders in the GSM Galaxy Tab’s stock ROMs. The solution is in the form of a PATCH which you can download as an APK file . Install it in the TAB, launch it and apply the patch if necessary. What this patch does is to allow you to flash Back to the original JJ4 bootloader version, a version that is indeed unlocked.
The patch has been tested repeatedly and with success on (0 bricks so far) – ONLY GSM versions:
– GT-P1000 Euro/International/Unbranded Galaxy Tab
– SGH-I987 AT&T Galaxy Tab
– SGH-I987 Rogers Galaxy Tab
– SGH-T849 T-Mobile Galaxy Tab
– GT-P1000L Latin Galaxy Tab (use LATIN version!)
– GT-P1000N Latin Galaxy Tab (use LATIN version!)
Both of them started the patch specifically for the newer firmwares JM6/9/A/C/D/E/F . These firmwares for the Samsung Galaxy Tab come with “signed / protected” bootloaders. These new bootloaders prevent you from flashing custom or otherwise unsigned kernels on the device. Trying to do so will result in errors and usually requires you to reflash your ROM completely. The result is that once flashed, you cannot revert to older/official/custom Samsung ROMs.
Chainfire said ” The patch After a great many hours of researching, testing and coding, myself (Chainfire) and Rotohammer have come up with a patch that works on most devices (currently all known GSM Tab variants), and flashes back unprotected JJ4 (T-Mobile ?) bootloaders, or the original P1000N bootloaders for the Latin models. The app only patches when it finds protected bootloaders, and you have to press a button for that, so the app can also be used to look at your current status. “
As usual and a standard warning : Even though there have not been any bricks so far, replacing bootloaders is a very dangerous operation that may BRICK your device, and you should think twice before using the patch. Using the patch is completely AT YOUR OWN RISK!
Read the detail report at : http://forum.xda-developers.com/showthread.php?t=888071
These are the steps to do it : Your TAB must be rooted
1. Download the APK file and save it to your computer. The file name is SGT-Bootloader-Patch-v1.0.0.apk
2. Copy the APK file to your external SD card or transfer the APK file over to the TAB using KIES on mass storage mode.
3. Using a file explorer eg Astro File Manager, locate the APK , tap it to install
4. Once installed , Launch it. The app will check your TAB bootloader status and a report will be displayed, example on mine :
If your TAB is compatible and have protected bootloaders, the bottom entry “Patch bootloaders” will become available. Tapping it will start the patch procedure. You will see a status report similar to this :
Signed: PBL, SBL, Kernel
Not Signed: SBL_Backup
Assessment: Can only flash SIGNED firmware
ABC and layman understanding of Bootloader :
A bootloader is the first set of operations the smartphone does when it is turned on . It is a small program that loads an operating system kernel into memory and transfers control to it from the BIOS. It is analogous to the ignition starter in a car’s engine.
Antonios Sylvitis
February 23, 2011
Hello.
I have just received a Galaxy tab i987, purchased from AT+T in the states. To my disapointment it was Network locked to AT+T and no Phone. Obtained a code and my network was accepted. I still need to unlock the phone (European version) function. My problem is that can’t find the z4root in the market (smart guys removed it) and a download from the web lead to an error saying that “for security it is blocked etc”. So I can’t root it. And it looks that until I root it, can’t do anything else. Please help with some instructions for rooting. If I can root then I’ll proceed with your above mentioned bootloader flash.
Thank you very much. Antonios
leemn
February 23, 2011
Refer here for link to Z4 root ; just check it is live available
use method 2 superoneclick stated in my post too if z4root doesn’t work
Antonios Sylvitis
February 24, 2011
Hello dear Leemn.
I succeeded to root my i987, thanks to your instructions. Now I am in the process to flash the European version to enable Phone function. Any suggestion please ??
Thanks again.
A happy Antonios
leemn
February 24, 2011
Best is use Rotohammer JMI – use his PDA and PIT file, select repartition
http://forum.xda-developers.com/showthread.php?t=939360
His zip file doesn’t have phone/modem – so for this use Modaco JMF
http://android.modaco.com/content/samsung-galaxy-tab-tab-modaco-com/331081/xxjmf-modem-baseband-download/
helal
May 6, 2011
where to download
Francesco
September 22, 2011
Dear Leemn,
I have an GT-P1000 BRANDED “3” (an italian mobile network provider).
My tablet are “rooted” but I’m not sure if bootloader are protected.
I want to load the 2.3.3 Ginger standard ROM.
Can You help me in order to lowest risk of brik ?
Thanks in advantage.
Best Regards.
FRancesco.
Evil Dead
September 26, 2011
Hi. I rooted my 7″ tab but it has become flakey and freezes at the startup screen on the samsung logo.
Is there a way to use this when the Tab won’t boot (ie. From the bootloader screen?)
Anonymous
November 20, 2011
So this patch is used only on Froyo 2.2. ???
No need for it if you have Gingerbread 2.3.3 ???
Anonymous
January 16, 2013
Hi everyone,
I was wondering if I can get some help on getting my tab back on a road. Make long story short, here it goes.
OK. I was playing wit my tab last night and unfortunately it got stuck , nothing works , black screen. This happened after I tried to flash my tab to make calls with (Samsung TAB Euro Flash Package) From : http://forum.xda-developers.com/showthread.php?t=847273
At the time this happened my tab was rooted and I had a TWRP 2.3.3.1 and Goo Manager installed on ICS 4.0.4. I also saved all the backup files on my PC.
I was following the steps on a first page, after first flash something went wrong and now Odin doesn’t recognize the tab as before. And it’s being recognized by computer as a Qualcomm HS-USB QDLoader 9008 (COM4) . Now i’m lost and don’t know what to do. Please lead me in a right direction. Thank you.
wajid
January 30, 2013
i flashed a rom but nothing is happened. it does not load the device plzzz help me
rakionowner
June 11, 2013
Sir, after the installation has made, i’m launching the app, but stucked on “Detecting superuser…” , does it brick my device?
Kristoffer Grundström
April 2, 2014
What bootloader does this Tab have?
U-boot?
GRUB?
Lilo?
Fort Conquer hack
September 12, 2014
fantastic publish, very informative. I’m wondering why the other experts of
this sector do not realize this. You should proceed your writing.
I am sure, you have a huge readers’ base already!