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. First thing you will have to do is turning OFF your phone.
2. Now press and hold combination of three buttons which are: Volume Down + Quick button + Power button.
3. When LG logo appears on the screen you can release those buttons.
4. Now your phone will restart and you finished Hard reset operation.