In order to hard reset a Samsung Ativ S I8750, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung Ativ S I8750 device will be brought back to the default configuration of a brand new device.
1. Power down the phone.
2. Press'n'hold Volume Down and Power buttons. Release Power button after the phone vibrates.
3. Let go of other buttons when an exclamation mark appears on-screen.
4. Press these buttons in this order: Volume Up > Volume Down > Power button > Volume Down.
5. Now just wait for your phone to reset and restart. Done!