Get LineageOS for the LG G Pad 7.0 WiFi
Special boot modes
Recovery: With the device powered off, hold POWER+VOL DOWN buttons. When the LG logo appears, release both buttons and then hold again. When prompted to erase all user data, choose ‘Yes’. Once again choose ‘Yes’ to confirm and then device will boot to recovery.
Download: With the device powered off, hold VOL UP button and connect it to the computer. Keep holding VOL UP button until the firmware update screen appears.