Root Android 4.1.2 Offical Firmware Samsung Galaxy S2 GT I9100

Root Android 4.1.2 Offical Firmware Samsung Galaxy S2 GT I9100 

1.Download this file.GT-I9100 Root 4.1.2Thudanu.zip
2.Copy it to your phone external micro Sd.
3.Press volume up +Home key + power about 4 seconds to enter recovery mode.
4.At recovery mode, select apply update from external storage with volume down key and press power.
5. Select GT-I9100 Root 4.1.2Thudanu.zip with volume down key and press power key.
6.Wait until it was finished.
7.Now removed your phone batteryand insert it again.
8.Power your phone, and check superuser at your application list.