Hey all. Here is the issue I'm having. I'm using an iPhone 4 32GB on iOS 4.3.5 and using the Gevey SIM with T-Mobile. Lately I've been having a problem where I can't hear the people that call me or that I call and end up having to hang up and call them right back. I was going to have my buddy swap my phone out at the Apple Store he manages but he told me all of their new replacement phones come with iOS 5 on it. I wouldn't be able to use my Gevey SIM then. So I followed the instructions on this webpage: http://www.ijailbreak.com/how-to/preserve-iphone-ios-5-baseband/ I created the custom .ipsw, booted into DFU mode and tried to restore using the new .ipsw that redsn0w created. When I try to do the update, I get this error message: When I click the 'More Information' button, it takes me here: http://support.apple.com/kb/TS1275 I'm at a loss on what to do next. My phone still boots back up properly to the 4.3.5 OS and I can still use it but the software glitch that makes me unable to hear the callers most of the time is really getting annoying. The phone is NOT jailbroken. I am running iTunes 10.5.1 and I only threw the Gevey SIM in and use the phone for talk, text and web.. nothing else. Any ideas?