N4BB

Ozy from AwkwardTV has managed to get his Apple TV to boot from an external USB drive into the recovery mode.

It appears if you attach the USB drive with a duplicate of Apple TV OS, boot the Apple TV normally, attach the USB drive, and then do a recovery reboot (holding ‘menu’ and ‘-‘ keys on the remote) that the machine will begin to boot from the USB drive.

You can see his video here.

This opens the possibility up for booting off a USB drive to make modifications to the Apple TV without having to open the case. Good work guys!