You Can Only Downgrade to iOS 9.1
If you're on something older than iOS 9.1, know that you won't be able to downgrade to anything older than iOS 9.1.
Apple's stopped signing on iOS 9.0.2 which means that the only update you can move to is iOS 9.1. For some of you, that'll be a big problem.
The company will continue signing off on iOS 9.1 (or whatever is the latest update) until the iOS 9.2 release. In other words, you'll always be able to drop back off the iOS 9.2 beta if it's giving you too many problems.
This article may contain affiliate links. Click here for more details.