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For those of you who want to root T-Mobile Galaxy S2, the SGH-T989 model, here’s a simple method to root your Galaxy S2, it’s very safe and works on all versions.
For Mac OSX, you can use Heimdall Frontend to install kernels, see How to Install Kernels using Heimdall video. Heimdall is NOT COMPATIBLE with T-Mobile Galaxy S2!
Step 1. You will need a micro SD card, insert into your T-Mobile Galaxy S2.
Step 2. Connect your T-Mobile Galaxy S2 to your computer via micro USB cable and set it as disk drive mode.
Step 3. Download tmobilegalaxys2root.zip, unzip(uncompress) the zip file, then copy over the su-3.0.5-efgh-signed.zip to your micro SD card (not internal storage).
Step 4. Take the back cover off then pull the battery out and put it back in. Then while holding down Volume Up and Volume Down buttons together, plug in the micro USB cable to your computer.