Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers to keep their operating systems up to date.
iOS 12.1.3 is now the only version of iOS that can be installed on iPhones and iPads, but developers and public beta testers can download iOS 12.2, a major update that’s currently being beta tested.
Apple will also soon release iOS 12.1.4 to fix a major FaceTime privacy bug.
This article, "Apple Stops Signing iOS 12.1.1 and 12.1.2 Following Release of iOS 12.1.3" first appeared on MacRumors.com
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