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. To start the hard reset process you will have to turn off your device.
2. Then wait approximately 10 seconds and press and hold power button with volume down button at the same time.
3. When you will see LG logo on the screen you can release the buttons.
4. After that, your phone will boot recovery mode menu.
5. Now using your volume buttons to move highlighted area go to wipe data/factory reset and select it with Power button.
6. This is it! Your phone will now restart and will be ready to use very soon.