I have an iPad v.1 running iOS 4.2 that won't update to iOS 4.3. Says "Your iPad software is up to date". I've got the latest iTunes (10.2.1) and I've even updated my wife's iPad just fine. Thoughts? The Googles hasn't helped. On top of that the 4.3 IPSW is gone from the wife's install so I can't restore to that.