jailbreak not recognized by aTV Flash on ATV2

I have 2 ATV2s. I have jailbroken the first many times and followed up with aTV Flash for XBMC, 1channel etc etc. works perfectly. no problems.

I recently bought a second online for $200 (ATV2), model M572LL/A from ebay.  I tried a tethered JB with seas0npass (its running 5.2.1) and i get a ‘success’, so i disconnect the USB only and plug in my HDMI.

Next i run ATV Flash from my mac and select the newer second ATV2. I get a message saying Failed! This ATV is not jailbroken.

Can anyone offer a few ideas for me to try. This was supposed to be a gift for a friend.

thx