How to restore iPhone 4 after interrupted update to iOS 5? iTunes returns unknown error

Hello! I've tried to install iOS 5 beta on my iPhone 4. in the middle of the update XCode displayed something like "couldn't update", then I tried to restore iPhone using iTunes, but each time it throws "couldn't restore. unknown error". now i can't turn device on, it shows

Anergy wrote:
Hello! I've tried to install iOS 5 beta on my iPhone 4. in the middle of the update XCode displayed something like "couldn't update", then I tried to restore iPhone using iTunes, but each time it throws "couldn't restore. unknown error"
Please post in the developers forum. iOS 5 is unreleased Beta software and is not to be discussed here.
Stedman

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