For Hard Reset Make Sure Your Device battery Charge is Full.
1. Press And Hold Power Key To Turn Off Your Smart Phone Than Remove Battery And Reinsert.
2. Now Press And Hold Volume Up + Home Key + Power Key Until Show Samsung Logo On Screen.
3. When Show Logo On Screen Release all Keys.
4. After Few Second Show Android Recovery Menu On Screen.
5. After Show Recovery Menu Use Volume Down Key To Scroll and Select This Option "wipe data / factory reset" Power Key To Confirm.
6. Now Again Use Volume Down key To Select "Yes -- delete all user data" Press Power key To Confirm.
7.After Finish Hard Reset Processing Select "reboot system now". Again Press Power key To Confirm.
Done.