EASY METHOD:
- First, turn off your Samsung Galaxy E7 by pressing Power Button.
- After power off wait 15 sec .
- Now press and hold together: Volume Up + Home button + Power button.
- Release held keys when Phone vibrate or see an Android icon.
- Then select “wipe data / factory reset” using Volume buttons to navigate and Power button to confirm.
- Next choose “Yes — delete all user data” to confirm whole operation.
- after all restart the device select “reboot system now”.Use Power button to confirm.
- Hard reset done !!
Watch This Video to clear upper step: