Android recovery is a bootable partition, which lets you apply official system updates from SD Card, factory reset your phone or wipe its cache partition.
How to enter LG Optimus 2 AS680 recovery mode ?
Power off your device.
Boot in recovery mode by pressing and holding Volume Down and Power Button at the same time.
Release all buttons when the LG Optimus 2 AS680 screen flickers and in a few seconds the Recovery screen will appear.
If the above-mentioned
method doesn't work for you, you can try the following
Power off your device.
Wait a few seconds
Boot in recovery mode by pressing the Volume Down and Power Button at the same time for 2-3 seconds until the LG logo appears on the screen.
Release the buttons and press them again until the Recovery Screen appears