I downloaded the IPSW from the web and copied it to the update file directory for iTunes. I already had the latest version. I then plugged the phone in and it asked me if I was ready to install. I said yep, and it backed up and installed without any error at all. First try. I run Win 7 x64 Professional. I don't know if that has anything to do with it or not. Only took about 25-30 minutes from beginning to end.