Apple stopped signing iOS 14.2 and iOS 14.2.1 this week, meaning users who upgraded to iOS 14.3 can no longer go back again. The same goes for iPadOS 14.3 and those who installed it.
iOS/iPadOS 14.3 added support for Apple Fitness+ and AirPods Max. For users with an iPhone 12 Pro, it also allowed them to take photos in the Apple ProRAW format. In addition, the updates included new privacy information and an assortment of bug fixes.