Very basically, I can't get the 4.0 Beta 1 OS to install. My phone's UUID is registered, I updated iTunes on the mac to the latest version, and I have the ipsw file for the 4.0 OS. When I try to restore in iTunes, it gets to the point where the install bar on my phone's screen starts to fill, but it hangs at the beginning and doesn't move. I left it for over 30 min. My only thought is that the Mac I was using doesn't have the SDK installed; does it need to be? If not; any ideas? I've already tried downloading the ipsw twice from different sources.