In usual manner following iOS 16.2 release Apple now stops signing iOS 16.1.2 preventing downgrade.
Reference: Apple Stops Signing iOS 16.1.2 Following iOS 16.2 Launch
In usual manner following iOS 16.2 release Apple now stops signing iOS 16.1.2 preventing downgrade.
Reference: Apple Stops Signing iOS 16.1.2 Following iOS 16.2 Launch
Since iOS 16.1.2 release Apple no longer signs previous iOS releases preventing downgrades.
Reference: Apple Stops Signing iOS 16.1 and iOS 16.1.1 Following iOS 16.1.2 Launch
Following iOS 15.4.1 release Apple now stopped signing iOS 15.4 preventing downgrade on devices.
Reference: Apple Stops Signing iOS 15.4 Following iOS 15.4.1 Release, Downgrading No Longer Possible
Apple now no longer signs iOS 15.1.1 preventing downgrade from iOS 15.2.
Reference: Apple stops signing iOS 15.1.1, blocking downgrade from iOS 15.2
Apple no longer allows downgrade to iOS 15.0. Now devices could only be restored to iOS 15.0.1 release. Previously, Apple stopped signing iOS 14 releases.
Apple now prevents downgrade from iOS 15 and iPadOS 15. This means that during restore operation, device will receive iOS 15 or iPadOS 15 accordingly. This seemingly would improve iOS adoption rate.
Having no other iOS 14.x update, any previous version will now be only updated to iOS 15 too.
This needs to be taken into consideration for test devices.
Apple stops signing iOS 14.7 preventing downgrade from 14.7.1. Apple typically stops signing older released from time to time. iOS 14.7.1 contains significant security fixes.