Hard Reset SAMSUNG I9260 Galaxy Premier

First method:

1. Make sure, that your phone is on.
2. Then enter the code: *2767*3855#

Second method:

1. Turn off your phone.
   
2. Press and hold Volume Up + Home button + Power button.
   
3. When the phone vibrates release only Power button.
4. Then if you see Andoid green man, then release all buttons.
5. Next select "Wipe data/Factory reset" from the menu, using Volume Down to browse, andPower button to confirm operation.
6. Select "YES -- delete all user data", and confirm this operation.
7. After format, press Power button again to reboot phone. (select reboot system now)

WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.