- First power off your device.
- Next hold and press R key from QWERTY keybord + Power button.
- Release them, when logo Samsung will appear second time.
- Then select option "wipe data/factory reset", using Volume buttons to browse option, and Power button to confirm operation.
* If Power button doesn't work, then use Home button to confirm operaions.
- Now choose "yes" from the menu, and confirm that.
- After that, press Power button to enter option "reboot system now".