This method will just install a stock 4.1.1 Jelly Bean ROM on your Galaxy S3 T-Mobile. This will NOT unroot your phone!
If you already have ClockworkMod installed on your Galaxy S3 T-Mobile this is the best method to get the full 4.1.1 Jelly Bean stock ROM, and it's pre-rooted!
1. Download Deodexed_T999UVDLJA.zip using the link below.
Download Deodexed T999UVDLJA.zip
2. Enter your phone into ClockworkMod Recovery mode. Power off your phone.
3. Press the volume up, home center button, and power button all at the same time.
4. When the phone vibrates let go of the power but keep holding onto the volume up and home center button until you enter into ClockworkMod Recovery mode.
5. Select "wipe data/factory reset" and choose "yes".
Note: This will wipe all your apps, settings, etc on your internal memory so make sure you backup your phone!
7. Next, choose "advanced".
8. Select "wipe dalvik cache and choose "yes".
9. Choose "+++++Go Back+++++".
10. Then, "install zip from sd card", after that select "choose zip from sd card".
11. Find "Deodexed_T999UVDLJA.zip" and select "yes".
13. Once your phone has finished booting up you will be on stock 4.1.1 Jelly Bean ROM for your Galaxy S3 T-Mobile.
Credits - XDA
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