A Hard Reset reverts a phone to its original settings and a clean OS (Operating System) removing all data and information added to the cell phone by the mobile phone user.
In essence a Hard Reset erases everything from the phone and puts the phone back to like new condition as though it’s brand new right out of the box.
1. Firstly, make sure you phone is OFF, if it's not then hold down power button.
2. Press the volume down button and power button at the same time and hold them for several seconds.
3. When you will se LG logo, release the keys and wait few seconds.
4. Now there should be a recovery mode menu on your screen.
5. Using volume buttons to navigate find wipe data/factory reset option.
6. Select it with power button to end the whole process. And this is it!