Apple stops signing iOS 26.5.1 after critical security fix release

Apple is no longer signing iOS 26.5 and iOS 26.5.1, preventing downgrades to these software versions from newer releases.
MacRumors

Apple Stops Signing iOS 26.2 Beta 1 for iPhone Air, iPhone 16e, and Cellular M5 iPad Pro

A day after seeding the first developer betas of iOS 26.2 and iPadOS 26.2, Apple has stopped signing it for the iPhone Air, iPhone 16e, and cellular models of the new M5 iPad Pro, preventing those ...
9to5Mac

Apple stops signing iOS 18.5, blocking downgrade from iOS 18.6

It’s been just over a week since Apple released iOS 18.6. Since the iPhone software update has shipped without issue, Apple has stopped signing the older iOS 18.5 software version. Apple stops signing ...
GizChina

Apple Blocks Downgrades as iOS 26 Becomes the Only Option

iOS 26 rolled out on September 15, 2025, for the iPhone 11 through iPhone 17 series, as well as the iPhone SE. Now, less than two weeks later, Apple has removed the option to install older builds. For ...