In order to hard reset a LG U960, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
LG U960 device will be brought back to the default configuration of a brand new device.
1. Turn on the phone by holding down the Power button.
2. Press the Call button in order to open the dialer.
3. Now type this code into the dialer: either 2945#*101# or 1809#*330#
4. Lastly, press the Call button again. Your phone will now reset and restart. Well done.