I have a phone that iREB reports as being in DFU mode. I'm trying to upload a sn0wbreeze built IPSW via iTunes and am getting a 1600 error message. first time I got this error, it was because the phone (2g) wasn't in DFU mode. But now iREB confirms it is. I'm totally stuck. What can I do? Something wrong with the ipsw file?