After the launch of iOS 16.1.2 on November 30, Apple stopped signing iOS 16.1.1 and iOS 16.1, the two previously available versions of iOS. Since iOS 16.1 and iOS 16.1.1 are no longer signed, it is not possible to upgrade to these versions of iOS after updating to iOS 16.1.2.
Apple usually stops signing older versions of software updates after new releases are released to encourage customers keep systems updated to the latest version, so it's not unusual for updates to no longer be signed.
iOS 16.1 was a major update that added support for iCloud Photo Library and Live Activity, while iOS 16.1 .1 was a bug fix update.
iOS 16.1.2 will soon be replaced by iOS 16.2, a major update that is in testing and due next week. iOS 16.2 will introduce enhanced data protection for iCloud, Freeform app, Apple Music Sing and other new features.
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