In order to hard reset a LG U8100, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
LG U8100 device will be brought back to the default configuration of a brand new device.
1. Start the phone by holding down the Power button.
2. Now open Main Menu and select Reset Settings and Master Reset.
3. Almost done. Type in the security code, 0000 by default.
4. Your phone will now reset and restart, concluding the hard reset process. Well done.