I spent all last evening trying to jailbreak my Apple TV 2 using Seas0nPass and other utilities, over and over I would get differing error codes. Whether I used my Mac or a PC.
This morning I went to my wife’s Mac and it installed first try. So I guess the trick is, if you’re getting error codes, to use another machine.
I did make the mistake of thinking I had to install aTVFlash with the Apple TV 2 attached to my Mac. Wrong. You’ve got to plug it back into the TV and the network and install aTVFlash as you would a normal update.
Now everything is working fine.
Good luck. The app now gives me access to all the files on my Mac and plays AVI files on the Apple TV… plus a bunch of other things.