Recovery is included on a separate partition from the main Android OS on all Android devices.
You can boot directly into recovery mode and use it to factory reset the device, delete the cache partition, or apply software updates.
It can help you fix your device.
1. The first step that has to be done is powering off your device.
2. Now wait few seconds and press and hold Volume down+ Home button + Power button.
3. If you did the last step correctly the LG logo should appear, and you can release the buttons now.
4. Wait a moment and there should appear Factory reset screen:
5. That's it. If you want to know how to navigate in this screen then it's going to be volume buttons to go up or down and power button to confirm your choice.