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. Try to follow my steps carefully and it will be done in few minutes, first make sure your phone is turned off.
2. Now wait few seconds and press volume button down and power button combined and hold them.
3. When the LG logo appears on your screen.
4. Whole process has to be confirmed with pressing the Power button.
5. Now your device will restart and will be ready to use soon.