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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).