LG Optimus U hard reset
When you can’t recall your LG Optimus U unlock Pattern
1. Turn the power off.
2. Press and hold for over 5 seconds: Down Volume Key + Home Key + Power/Lock Key.
3. When the power turns on, release these keys
(Caution: If you perform a factory reset, all user applications and user data will be deleted. Please remember to back up any important data before performing a factory reset.)