For Hard Reset Battery Charge Need 70% UP
1. Press and hold Power key to turn Off your device.
2. Now Press And Hold together Volume Up + Home + Power button to turn on your device until show logo on screen.
3. when show android recovery menu on screen release all keys
4. Now Use Volume down key to select "wipe data / factory reset" than press power key to confirm.

5. Now Again use Volume Down key To Select "Yes -- delete all user data" press power key to continue

6. it's last step just select "reboot system now" press power key and wait few second device will be automatic restart problem is solve.
done.