Odin3 is a software design to help us to update Samsung Android Phone Firmware. It is widely used by Samsung Galaxy S2 owners. We used it to root and unroot our S2. In addition, we also use it to update firmwares and kernels. This is an essential tool is want to try custom firmware on your SAMSUNG Galaxy S2 Phone.
Pls ensure that you do not open Kies when using this software. Check that it is not in the system tray also.