Apple Stops Signing iOS 26.6.2, Blocking iOS 27 Downgrades 1 Week After Launch
Updated
Updated · MacRumors · Sep 21
Apple Stops Signing iOS 26.6.2, Blocking iOS 27 Downgrades 1 Week After Launch
3 articles · Updated · MacRumors · Sep 21
Summary
Apple has ended server-side signing for iOS 26.6.2, leaving users who already installed iOS 27 unable to roll back to any iOS 26 release.
That block works through Apple’s verification system: unsigned software fails the restore check and cannot be installed, a policy Apple uses to keep older, less secure versions off devices.
Users who stayed on iOS 26 can continue running it, but upgrading to iOS 27 is now effectively one-way.
iOS 26.7 also is not a fallback path because it shipped only as an over-the-air update alongside iOS 27 and has no restore file available.