Hard Reset SAMSUNG I9205 Galaxy Mega 6.3

1. Power off your phone.
2. Press together Power button + Volume up + Home button.
   
3. Release your fingers when Samsung logo appears on the screen.
4. Browse with volume buttons and select "wipe data/factory reset" with Power button.
5. Confirm "yes" with power button.
6. Wait until the format is complete.
7. Select "reboot" and press power button to select it.
8. Wait until the phone restarts

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