Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple release iOS5 Beta 5 to developers
To install iOS 5 beta 5 using over the air software update follow these simple instructions!
- erase all content and settings on your device by choosing Settings General > Reset > Erase All Content and Settings
- Over the air software update can be initiated on devices running iOS 5 beta 3 and later by choosing Settings > General > Software Update.
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