A hard reset, also known as a factory reset or master reset, is the restoration of a device to the state it was in when it left the factory.
All settings, applications and data added by the user are removed.
The term is often heard in reference to smartphones and tablets but laptop and desktop computers, as well as most other electronic devices, can usually be restored to factory conditions.
1. The phone must be turned OFF for this operation so please do that.
2 Then press and hold Volume Down + Home button + Power button.
3. Release them after 8 seconds, when LG logo appears.
4. Now your device will Restart and Hard Reset will start automatically, after that you can use your device.