Hard Reset SAMSUNG S7562 Galaxy S Duos

1. Switch off your phone.
   
2. Then press and hold together Volume Up + Volume Down + Home button + Power button.
   
3. When the Samsung logo appear, then release your fingers out of the phone.
4. Choose using Volume Buttons option "wipe data/factory reset", and confirm that withPower button.
   
5. Select "yes" with Power button.
   
6. After that, press Power button to select "reboot system now".
   

WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.