Use A Hardware Button Combination Turn off your phone; don’t just reboot it, complete a full power off process: press the Power key and select “power off” or press and hold Power button for a few seconds. Now press and hold (at the same time) the Power and the Volume Down keys. Release only the Power button when the LG Logo image is being displayed on your G4. Then, immediately press Power key once more (during this time you should still press the Volume Down button). As soon as the Factory reset screen is displayed, you can release the buttons. You can now press Power button once in order to confirm or one of the Volume Rocker keys in order to cancel the hard reset operation.