
Hard Reset will erase all of your data
All described operations you are doing at your own risk.
First method:
1. Switch off the phone.
2. Press and hold the Volume Up, Home and Power buttons.

3. When you see the Galaxy logo release only the Power button.
4. Use the Volume Up/Down buttons for navigation and the Power button for choice.
5. From the android system recovery menu select:
- Yes -- delete all user data

- reboot system now
- Thats ALL !!
Second method:
- go to Menu -> Settings -> Backup & reset -> Reset device -> Erase everything.
- Then wait until your device will reset and reboots.
- Good job!