Can't update to iOS 5 Beta 2?

I have an iPhone 4 running iOS 5 Beta 1. I downloaded the iOS 5 Beta 2 firmware and iTunes 10.5 Beta 2. I did the Option restore thing on iTunes. When it tries to restore it says " This device isn't eligible for the Requested build".. Why is it doing this? I have my UDID activated. Why isn't this working? Please help!