Sorry for the bad english....:$
The jailbreak with Sn0wbreeze is not working on my ATV2.
Power+USB+Blocking Apple Server (Hosts)=No
USB+Blocking Apple Server (Hosts)=No
Installing the original firmware 4.2 or 4.3 with Shift-Restore is working.
Installing Greenp0ison with 4.2 is working.
And no,i have no Macbook,Macbook Pro,Macbook Air or G-Mac.... :-( I need a solution for windows...
German Error:"Wiederherstellung fehlgeschlagen....Error 21".The helpfile said:Try another USB Cable or go direct into
the Internet or disable Software (Firewall etc)....