I wanted to downgrade one of my iphones from ios 5 to 4.3.3, just for the untethered jailbreak solution. itunes 10.5, unpacking files for firmware etc, after the server check, the error 2005 comes up. Looking for answers on the internet, gave me: Change USB cabel or port.. Well that didnt work out... Anyone having this problem??? Or a solution would be awesome !!