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T-Mobile just pushed out official Jelly Bean update to everyone with a T-Mobile Galaxy S2 SGH-T989.
Now, if you are on custom ROM or have problems updating, there’s an easy way to manually update or “unroot” your T-Mobile GS2 to the latest Jelly Bean updates.
By unrooting to the latest Jelly Bean, you will lose root (but it’s easy to re-root, root method is same for Gingerbread, ICS, and Jelly Bean).
UPDATE: Now there’s a CWM-flashable rooted version so you can install it using CWM Recovery, see here.
Step 1. If you are on stock ROM, you do can skip this step. If you are not on stock ROM but on a custom ROM, reboot into CWM Recovery and wipe data/factory reset.
Make sure you backup your ROM and your apps beforehand as this will erase all your settings and apps (but not contents of your internal storage/sdcard).
Step 2. Connect a USB cable from your T-Mobile Galaxy S2 to your computer. Then hold down Volume Up, Volume Down, and Power buttons together for around 10 seconds until your phone reboots and you feel a small vibration signaling reboot.
At this point, only let go of the Power button but keep holding down Volume Up and Down buttons.
If you see the warning screen, hit Volume Up button to put your phone into Download Mode.
Step 3. Download the Official Jelly Bean Stock Firmware and ODIN, extract both. You should get a file ending with “tar.md5” (this is the stock firmware), and also ODIN program.
Download Samsung USB Drivers (if you don’t see yellow highlighted box with ODIN)
Step 4. Run ODIN. Make sure you see a yellow highlighted box with a random COM number. If you don’t, download and install Samsung USB drivers (from above link).
DO NOT TOUCH ANYTHING ELSE but hit the “PDA” button then choose the stock firmware you extracted in Step 3, the file T989UVMC6_T989TMB_T989UVMC6_HOME.tar.md5.
Then hit Start button.
Step 5. It should take 10-15 minutes for ODIN to flash the Jelly Bean stock firmware. Once done, you should see a green box with “PASS!” then your phone will reboot automatically and you should be on the official Jelly Bean firmware, congratulations!
If you need to root it, simply follow How to Root Jelly Bean/ICS/Gingerbread on T-Mobile Galaxy S2!