Special boot modes
Recovery: With the device powered off, hold Power + Volume Down. When the LG logo appears, release both buttons and then hold them again. When prompted to erase all user data, choose ‘Yes’. Once again choose ‘Yes’ to confirm and then device will boot to recovery.Note: Accept the factory reset prompt using the hardware buttons. If you have done everything correctly, this will not actually reset your device but instead will boot the custom recovery.
Bootloader/Fastboot/Download: With the device powered off, hold Volume Up and connect it to the computer. Keep holding Volume Up until the firmware update screen appears.