T-Mobile Galaxy S2 SGH-T989 was launched by Samsung in the year 2011 and the device sports a 4.5 inch Super AMOLED display with 480 x 800 pixels resolution. It is powered by 1.5 GHz Dual Core processor coupled with 1GB RAM and is available in 16/32GB variants. The device runs on Android 2.3.5 Ginger Bread out-of-the-box and is updated to Android 4.1.2 Jelly Bean. As the Samsung has not yet rolled out the Android 4.4 Kitkat update for T-Mobile Galaxy S2 SGH-T989, we have brought here CM 11 Custom ROM to update T-Mobile Galaxy S2 SGH-T989 to Android 4.4.2 Kitkat firmware. So let’s proceed further and update T-Mobile Galaxy S2 SGH-T989 to Android 4.4.2 Kitkat firmware using CM 11 ROM.
Make sure your device model is T-Mobile Galaxy S2 with model no SGH-T989. Check in Settings > About. Enable USB Debugging on your device from the Developer Options. Charge your device to at least 75%.
Make sure your device is rooted and has latest Custom Recovery installed.
How to update T-Mobile Galaxy S2 SGH-T989 to Android 4.4.2 Kitkat firmware using CM 11 ROM:
Step 1: Download CM 11 ROM Package and Google Apps Package from here to your PC.
Step 2: Copy it to the Root of your SD card. Make sure not to copy inside any folder, just copy at the root of your SD card.
Step 3: Power off T-Mobile Galaxy S2 SGH-T989.
Step 4: Now check here to flash zip from recovery.