TWRP won't start adb sideload

Hi All,

I have an LGG2 802 with TWRP v2.7.0.0. I stupidly performed a factory reset within android and now can only boot to TWRP..

Trying to fix the situation by sideloading a rom, but I can't get adb sideload to start from TWRP > Advanced > ADB Sideload. All I get is the prompt saying 'starting ADB sideload feature...'

I don't see any devices on my computer using $ adb devices

If I hit cancel on the phone, I get 'ADB sideload Complete. Failed'

If I restart the phone using the TWRP restart menu, whatever choice I make 'system' / 'recovery' / 'bootloader', I just get to TWRP.

Help!