You Can Only Downgrade to iOS 9.1
If you want to try the iOS 9.2 beta early, you should know that there is no longer a way to drop back down to anything older than iOS 9.1.
Apple's closed off the iOS 9.0.2 downgrade loophole and we're now stuck with last week's iOS 9.1 update. Which isn't a bad thing. The iPhone 5s iOS 9.1 is an excellent update and it's a great excuse to move off of iOS 8 or whatever you're on.
If you're on iOS 8 or something older, you'll need to be absolutely sure that iOS 9.2 beta is somethng you want to install. There's no going back once you make your move.
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