Trying to update my iPhone 4S to iOS 5.1. Plug into my Mac Mini and iTunes opens. Pop up remind me iOS 5.1 is available. Then choose update. Then it tries to contacting update server. Half an hour later, still trying to do the same thing. Tries 3 time, 2 hours passed. Nothing. Unplug from Mac Mini, then went go general, software update. click Download and install. Agree the license agreement. It starting to download process. Stuck on estimating time remaning . 2 minutes later, error message pops up saying:" An error occurred downloading iOS 5.1." Gives me 2 option: close and setting. Hit setting, brings me back to software update page. Tried 5 times. Nothing. Now could it be my iPhone's problem? Is there any setting need to be changed? Or it just Apple's server isn't responding anymore. God, roommate wants to play Japanese Siri, hopefully i can get this thing work before he comes back.