You Can't Downgrade to iOS 10.1.1
If you can't stand the iPhone 7's iOS 10.2 and its performance, know that you're stuck until Apple releases its next iOS update.
Apple is no longer signing off on the iOS 10.1.1 and iOS 10.1 updates which means you can't use a loophole to drop back down to either one of those. The company won't bring them back either.
If you're already on iOS 10.2, you can't get off it. If you're planning to move to iOS 10.2, you won't be able to drop back to whatever it is you're currently on.
If you think you might want to take advantage of the downgrade process in the future, take a look at our walkthrough.