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. Please switch off you device by holding down power button.
2. Then press combination of power button + home button+ volume down and hold them untill next step.
3. When you will se LG logo you can release the buttons.
4. Wait a few seconds and press the Power button to finish.
5. Now your phone will restart and in a moment will be ready to work.