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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!)
Step 4. Run ODIN3v1.85.exe by double-clicking on it. If you don’t see a yellow highlighted box with a random COM number, download and install Samsung USB Drivers.
Next, DON’T TOUCH ANYTHING ELSE but hit the “PDA” button.
Step 5. Choose the Jeboo kernel .tar file you downloaded earlier.
Step 6. Hit the “Start” button and this will start flashing the kernel. Once it says “PASS!” your Galaxy S2 GT-i9100 should reboot.
Step 7. Once rebooted, download Superuser zip file straight to your phone or you can also copy it over from your computer.
Step 8. Turn your phone again then hold down Volume Up, Center Home, and Power buttons together for about 20 seconds until your phone reboots into CWM Recovery.
Step 9. Choose “Install Zip”.
Step 10. Choose “Choose zip from Internal sdcard” or “Choose zip from sdcard”. (Depending on where the Superuser zip file is)
Step 11. Find the Superuser zip file, it’s most likely in your download folder.
CWM-SuperSU-v0.99.zip if your super user zip file.
Step 12. Installing this file installs su binary and Superuser app to your Galaxy S2 GT-i9100, giving you full root access.
Reboot and you should find yourself with a SuperSU super user app.
You can download rooted apps like Titanium Backup app and get a super user pop up window when you try to run it for the first time. Congratulations! You’ve rooted your Galaxy S2 GT-i9100!!!
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