ive had this error trying to go from 3.1.2 to 4.1 on my 3gs no matter what i try ive built my custon ipsw with sn0wbreeze and everytime i do it its either error 1604 or 1611 , so my only option is either try do it on a different pc or stay where i am never had any look with sn0wbreeze , so mate where are u have u a working iphone or is it stuck with black screen with white apple logo