Back up all data on the internal memory.
Turn off the device.Press and hold the Power and Volume down buttons on the back of the device.
When the LG logo appears, quickly release and then re-hold the Power button while continuing to hold the Volume down button.
When "Factory data reset" appears, use the Volume down button to highlight Yes.
Press the Power button to confirm.
When prompted to "Erase all user data and restore default settings," use the Volume down button to highlight Yes.
Press the Power button to reset the device.
Tried and Tested many time
Turn off the device.Press and hold the Power and Volume down buttons on the back of the device.
When the LG logo appears, quickly release and then re-hold the Power button while continuing to hold the Volume down button.
When "Factory data reset" appears, use the Volume down button to highlight Yes.
Press the Power button to confirm.
When prompted to "Erase all user data and restore default settings," use the Volume down button to highlight Yes.
Press the Power button to reset the device.
Tried and Tested many time