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.