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. First thing first, switch off your device by pressing down longer power button.
2. Now when it's switched off press volume down & power button.
3. Wait untill LG logo appears on screen, then you can release the buttons.
4. After a moment of loading you should see this menu:
5. To move up or down highlighted option use Volume buttons and to select option use Power button.
6. And now select wipe data/factory reset option to proceed and finish process.
7. Congratulations! Wait for your device to finish restarting and you are good to go.