In order to hard reset a LG GX F310L, you should perform the following steps.
Remember! Hard reset will delete all the data on your device; pictures, contacts, messages, apps and more.
LG GX F310L device will be brought back to the default configuration of a brand new device.
1. Turn off the phone.
2. After the device is down, press and hold the Power & Volume Down.
3. Let go of these buttons after an LG logo comes on screen.
4. Press the Power button (twice) to confirm.
5. Your phone will now reset and restart, thus completing the hard reset process. Congrats, you've done it.