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For those of you who want to root your Galaxy S2 GT-i9100 on Jelly Bean Android 4.1.1 or Android 4.1.2, here’s how to do it easily using a custom kernel.
This rooting process is pretty safe to do, does not erase anything on your phone, it just installs a custom kernel (which comes with a custom recovery) and we root the phone using SU binary and Superuser app. That’s it!
Step 1. Turn your Galaxy S2 GT-i9100 off. Then hold down Volume Down, Center Home, and Power buttons together for about 3 seconds until you see the warning screen.
Step 2. Hit Volume Up (you will be in ODIN Download mode) then connect a micro-USB cable from your Galaxy S2 to your computer.
Step 3. Download Jeboo Kernel and ODIN package. Leave the kernel file in .tar format but unzip (Don’t have unzipping program? Download and install 7Zip.) the ODIN zip files.
Download Jeboo Kernel for GT-i9100 (thanks to Jeboo!)