- First power off the phone.
- Next press and hold 2 buttons: Home button + Power button.
- Then release them when you see Samsung logo.
- Now choose with Volume buttons option "wipe data/factory reset", and confirm it with Home button.
- Select option "yes" and confirm with Home button.
- Choose with Home button option "reboot system now".
Hard Reset will erase all of your data
All described operations you are doing at your own risk.