I have a beta version of iOS 5 installed on my iPhone. I don’t remember which beta but version in About on iPhone says it is iOS 5 (9A5313e). I already replaced iTunes 10.5 beta with iTunes 10.5 (141) that is the recent version on the apple site. When I press “Check for Updates” it says: “This version of the iPhone software (5.0) is the current version.”. When I press “Restore” it says: “There was a problem downloading the software for iPhone. The requested resource was not found”. I have no other ideas what to do.
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Download the ios image from the apple dev center.
Then, hold down Option, and click “Restore” (in itunes with the device you want to upgrade selected). Then select the beta ios image file you downloaded when the file prompt shows up, and click “ok”.