For those of you who want to try out the latest official Jelly Bean Firmware for your T-Mobile Galaxy S2 SGH-T989, you don’t have to unroot, which will force you to root your phone again.
Instead, there’s a CWM flashable zip file, this is completely stock firmware with root added and you won’t lose your custom recovery as it’s packaged just like a regular, custom ROM.
You can grab it here:
To install, reboot into recovery, wipe data/factory reset (unless coming from stock or stock-like ROM), install ROM, and reboot.
Credits – XDA