Whenever your computer prompts you to install drivers or fails to install them automatically in the next steps, you should manually install them from device manager by pointing to the folder where you extracted them.
Download Odin from the link given below and extract the exe file from the downloaded zip file.Do not proceed if you are not sure about it. The letter or number after JP is the part extremely important to match.
Ours said ‘Froyo.XXJPO’ followed by a number and thus, we chose the file called ‘CF-Root-XX_XEU_JPO-v1.2-Busybox-1.17.1.zip’. This method is only compatible with the Samsung Galaxy S2, with the model number GT-I9100 and running on XXLPJ firmware. Note: You can check which one is applicable to you by going to Menu > Settings > About Phone and check the ‘Build Number’ option. Thanks to Chainfire, member of XDA Developers, there is now an easy to flash kernel that will not only root your Samsung Galaxy S2 GT-I9100 but will also install ClockworkMod Recovery and Superuser.
