Android Evil

Here are easy step by step complete tutorial for How to Rooting Samsung Galaxy S II (SGS2) Android smartphone. We have 4 methode, choose easy one.
Tutorial from xda-developers

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• Not working for KK6 2.3.6
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• Download the "DooMLoRD's Easy Rooting Toolkit v3.0" package from this thread and extract it to a directory on your hard drive using WinZip or a similar program.
• You need to have the USB drivers for SGH-I777 installed on your computer. (It will be "Samsung USB Driver for Mobile Phones" in Control Panel\Uninstall Programs.) Download and install the latest drivers from this thread. (x86 and x64)
• Both USB Debugging (Menu\Settings\Applications\Development) and Unknown Sources (Menu\Settings\Applications) should be enabled on your phone.
• Increase the screen timeout on your phone to 10 minutes. (Menu\Settings\Display\Screen Timeout) Remember to set it back to a shorter interval after you are done rooting.
• Connect the USB cable to the phone and the computer. Go to the directory where you extracted the package and execute "runme.bat".
• The toolkit will open a command prompt window where you will see the progress of the rooting process. It takes between 5 and 10 minutes for the process to complete.
• Success. You're rooted.

• Not working for KK6 2.3.6
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• Download "SuperOneClick v2.3.1 - Automatic Driver Installation" from MultiUpload and extract it to a directory on your hard drive using WinZip or a similar program.
• Please go the the SuperOneClick thread and read about the tool and how to use it. For Windows XP you need to have .NET Framework v2.0 or above installed. For Mac OS and certain flavors of Linux, you need to install Mono.
• I have not tested this tool. It is included here because it claims to work for Mac OS and Linux, and provides a way to use the ZergRush Exploit on those operating systems. Since I am only familiar with Windows, I will be unable to support this rooting method. For problems, try posting questions in the SuperOneClick thread linked above.
• If you try SuperOneClick on Linux or Mac, please post your (success or failure) results. Thanks.

• Download the "Odin3 One-Click Downloader Stock I-777 UCKH7 with Root no BL" package from MultiUpload or MegaUpload. Extract the contents of the zip file to a directory on your hard disk drive. This is a One-Click version of Entropy512's Return/Unbrick to Stock, Kernel + Rooted System Package plus stock modem from the development forum. (Contains stock zImage, factoryfs.img with root, and modem.bin.)
• Start the Odin3 One-Click Downloader program by double clicking on "I777UCKH7 OCD Root No BL.exe".<LI sizcache="1" sizset="76">Now Enter Download Mode:
  • With the phone powered off, plug in the usb cable while holding the vol up + vol down buttons (but not the power button).
  • When the warning screen appears, press Volume up to continue into download mode.
• In Odin, the small edit box in the upper left corner will turn yellow, and say something like [0:COM8].
• Click Start. Watch the progress bar advance in green while the message box in the lower area describes the steps. When the flash is finished, the top left larger edit box will turn green and say PASS! and your phone will automatically reboot.
• Unplug the usb cable from you phone after it boots up. Success. You're Rooted.

• Tested on Linux, should work on Mac OS
• Download and install the latest version of Heimdall Command Line for your operating system from here. (Latest version 1.3.1 at this writing.)
• Download Entropy512's Return/Unbrick to Stock, Kernel + Rooted System Package from here. Extract the PDA.tar file from this package to a directory on your hard disk drive, then extract the two component files from the tar - zImage and factoryfs.img.
• Place zImage and factoryfs.img both in the directory where you have the Heimdall command line executable, and enter the following at the command prompt:
  Code:
  heimdall flash --kernel zImage --factoryfs factoryfs.img
• Reboot the phone. Success. You're Rooted.