you run it from your PC when the XDA is in the cradle , it WILL remove all settings and programs you currently have on the device so make sure you backup what you want to keep.
It hard resets your phone, and upgrades to the newest version ROM.
it might error the first time ... simply run the program again and it will work.
Asus TF Prime - C20KAS - Androwook HB 2.31
Samsung Galaxy S4
Samsung Galaxy Note 2 (Work Brick)
Samsung Galaxy S2