For Hard Reset Battery Charge Need 70% Up.
1. At First Turn Off Your Device. remove battery and put again after 5 second.
2. Press and Hold Together Volume Up + Home + Power Key To Turn On Your Device.
3. After Show Samsung Logo On Screen Release All Keys.
4. Now Show Android Recovery Menu on screen Select this option "wipe data / factory reset" use volume down key and power key to continue.
5. Now Select "Yes -- delete all user data" Again press Power Key
6. Wait Few Second For Finish Hard Reset process Than Select "reboot system now" and press power key.
Done.