ATV2 4.4.4 jailbreak only to XBMC

I have jailbroken AppleTV 2 running 4.4.4 and ATV flash (black) that I’d like to “wipe” and install only XBMC on. Pretty sure I have a “tethered” jailbreak on it now. Do I need to save blobs, or somesuch, before proceeding? What’s the process?

If you are on 4.4.4 you should be untethered…