title: Installing previous version of iOS on developer device (currently 5.0 -> want 4.3.5)
body: <p>I'm a registered Apple dev, and I got a new phone. My old 3GS currently has 5.0 installed on it and I'd like to put 4.3.5 on it for testing apps under iOS 4. I've downloaded the 4.3.5 ipsw, and using Organizer in Xcode I can attempt to install it, but get the "The Device isn't eligible for the requested build" error. The phone restarts and goes to DFU mode.</p>
  
  <p>Am I missing something? </p>