Same here. Except - I was able to successfully SSH in after doing the jailbrake - which according to the docs indicates the device is jailbroken. And I was able to load XBMC, nito tv, etc. And did so before I tried to load aTV Flash black. Had even checked with presales to make sure I could do the installs in that order.
So - I submitted a support ticket. While waiting, I swapped a HDMI cable - which fixed a couple of other issues. Tried aTV flash install again and I was finally able to get aTV Flash to ‘install’ - got a success message - however I can’t see the software on aTV2 - install says it completed but I can’t see the software - no browser entry, etc.
As soon as I get input from support I’ll post the results.