Recovery, in Android, refers to the bootable partition, in which the recovery console is installed.
It contains tools to help repair your installations as well as install official OS updates by using a combination of key presses or instructions from a command line sometimes.
Android is open, meaning the recovery source code is available, so that building a customized ROM is relatively easy.
1. Lets start from turning off your device, if your phone is on, please turn it off by holding down Power button and picking Power Off option.
2. Now when the device is turned off, press and hold Volume down + HOME + Search buttons + POWER on your LG phone.
3. Let go off the buttons once this hard reset menu will show up:
4. If you see this screen it means you did everything correctly, congratulations.
Tip: If you need to navigate in "Recovery mode", use the Volume up button to move up and and the Volume down button to go down, press power button to select.