In order to hard reset a Samsung P930, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
Samsung P930 device will be brought back to the default configuration of a brand new device.
1. Power up the device.
2. Tap in the code *2767*3855#
3. Confirm with Call button.
4. Phone will now reset and restart.