In order to hard reset a Samsung i750, you should perform the following steps.

Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung i750 device will be brought back to the default configuration of a brand new device.

 

1. For starters, press and hold the Power button until your phone turns on.

2. Tap the *2767*3855# code into your phone. Next, press Call button to confirm.
3. After a few minutes your phone should reset & reboot. Congrats.