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Discalamer: Im not responsible if you brick your device proceed at own risk
How to root Samsung Galaxy S2 GT-19100
[Will only work if your running android 4.0]
Step 1: Put your Galaxy S2 into download mode by holding down Volume Down, Center, and Power button together for around about 10 seconds.
Step 2: When you see the warning screen, hit the Volume Up button to enter download mode
Step 3: Connect any micro USB cable from your Galaxy S2 to your computer
Step 4: Download ODIN program and CF Kernel From Below. Then unzip both files.
Step 5: Run the ODIN program. You should see a yellow highlighted rectangle box with a number. If you don’t you need to install Samsung Kies After installing un-plug your phone then plug it back in you should now see it.
Step 6: Hit “PDA” and choose the “CF-Root-SGS2_XX_XEO_LPQ-v5.3-CWM5.tar” file you unzipped before
Step 7: Hit “Start” and the kernel will start flashing to your phone then your phone will reboot when its finished
Step 8: Once your phone has rebooted check that you have the SuperSU app. If you do you have sucessfully rooted your phone congratulations

also credit goes to Zedomax from galaxys2root.com