You can use commands, but you need to use the Amon based recovery. Its old, 100% working, and only works on old screen.
You can use ADB on windows. You prepare the zip, plug it up, ADB push it to Data, flash, wipe data, then boot phone.
It takes the same time as flashing it via the phone as well.
Sent from my LG-VM670 using Tapatalk 2