1. Press and hold down Volume Up + Home, and the Power button at the same time. 2. Keep holding these buttons, until you see the Samsung Logo shows itself, and then release all the buttons. 3. Press Volume Down to select Wipe Data / Factory Reset. 4. Press Home button to select. 5. Now choose "Yes -- delete all user data" using Volume Down key. 6. Now to confirm use Home button. 7. Once you have performed the hard reset choose Reboot System Now, Press Home button to confirm.