Link to bootable image for Mycroft II?

I received my Mycroft II yesterday.

In the absence of utilities for installing skills (boo!), I’ve mucked with the device a bit via ssh.

Before I go much further with hacking it, where can I get a bootable image in case I want to nuke it from orbit and start with the factory install again, particularly when there’s an update to the supported software that fixes some of the teething issues.