Apple today released iOS 9.2 and for those who already got the update but doesn’t like it can still downgrade back to their previous firmware. Although, this version contains a number of fixes some users continue to experience bugs and, even more, problems. Furthermore, iOS 9.2 isn’t a major firmware where iPhone and iPad users will actually get to use new features and design.
With that being said, it won’t hurt you if you decided to downgrade from iOS 9.2 back to iOS 9.1. In fact, if you can upgrade again whenever you wish to but downgrade has its limited time. Once Apple close their signing window, you will not be able to downgrade.