I tried to upgrade to the new iOS 9 on my iPad 3 tonight. Now all it will do is ask for my new 4 digit passcode, the build line goes to about a 5th of the way, then the screen goes black, then comes back with a "Swipe to Upgrade" page. I swipe to upgrade, then it asks for my 4 digit passcode, then the line builds a 5th of the way, and then, well, the loop continues..... I hook my iPad up to my MacBook Pro but it won't recognize my it to let me re-synch it. Any suggestions on what I can do?