How to update T-Mobile Samsung Galaxy S3 to Android 4.1.2 Jelly Bean [ Custom ROM]

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The Samsung Galaxy S3 has already received Android 4.1 Jelly Bean update. However, Galaxy S3 users on various carriers like: Bell, Rogers, Verizon, AT&T, T-Mobile, etc. are anxiously waiting for their turn.

For those users who don’t want to wait for the official update can now update their Galaxy S3 via the port of the official Jelly Bean release from Sprint patched with the leaked UVDLI8 JB build for T-Mobile. All these have been made possible by XDA senior member, DocHoliday77. Read below carefully to know how you will be able to flash this update onto your T-Mobile Samsung Galaxy S3.

T-Mobile Samsung Galaxy SIII Android 4-1-2 Jelly Bean update

Warning: Neither we nor the developer will hold any responsibility if you damage or brick your phone in the process of following this. Therefore, please proceed at your own risk.

Pre-Requisites:

What to do before installing ROM or Rooting your device?

Step 1: We always suggest a full backup of your Android device before you go for rooting or installing custom ROM. Backup all your SMS, Backup/Export Contacts, Backup APN settings. You can also follow our Tutorial on creating backup of Android device without root access.

Step 2: You should also Backup all apps, if you have not rooted your device yet then follow this procedure to backup apps. If you have a rooted device then use Titanium to Backup and restore apps and cache data.

Step 3: Enable USB debugging on your device, Go to settings>>Developer options and check the USB debug box. If you are not able to get it check our detailed guide on enabling USB debugging on Jelly Bean, Ice Cream Sandwich and Gingerbread.

Step 4: Always check your battery before performing rooting procedure or installing ROM. If you have low battery status then you may face interruption while the procedure and it may brick your device. Check our tutorial on how to get battery percentage on Status bar.

Step 5: If you are going to install Custom ROM then it’s better to create a full Nandroid Backup of your device. You can also use Custom recovery to create Nandroid backup.

Step 6: We would also suggest disabling security apps and programs like Antivirus and Firewall on your Android device as it may interrupt the procedure.

I am sure that if you take care of above mentioned steps carefully then there is lot less chance of issues. If you face any issues with ROM then you can revert back to previous Nandroid Backup. Also you have all SMS, settings and apps data with you that can be restored anytime.

Download the ROM file from here to your computer. Place the downloaded file onto the root directory of your phone’s SD card without extracting.

Procedure to Update T-Mobile Samsung Galaxy S3 to Android 4.1 Jelly Bean update ported from Sprint variant:

Step 1: Reboot your phone so as to enter it in ClockworkMod Recovery. To do so, press and hold the Volume Up + Home + Power buttons together until the screen turns ON.

Step 2: You can create a Nandroid backup of your existing g ROM so that you can revert the same whenever you want. To do so, go to “Backup and Restore” and then select “Backup”. Go back to main recovery menu after backup is complete.

Step 3: Now, from the main recovery menu, select “wipe data/factory reset” and then select “Yes” on the next screen that follows to confirm your action.

Step 4: Next, select “Wipe Cache Partition” and then select “Yes” on the next screen that follows to confirm your action.

Step 5: Finally, select “Advanced” and then select “Wipe Dalvik cache” and again select “Yes” on the next screen that follows to confirm your action.

Step 6: Now, from the main menu, select “Install zip from sdcard” then select “choose zip from sdcard” and then choose the file you’ve placed on the SD card.

Step 7: When the installation process has completed, select “++++Go Back++++” and then select “Reboot system now” to reboot your phone.

Great! You’ve successfully updated T-Mobile Samsung Galaxy S3 to Android 4.1 Jelly Bean update ported from Sprint variant. Do let us know if you face any issues, we are here to help you always.

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