Following a rigorous beta period, Apple unleashed its iOS & iPadOS 15.4 software updates for iPhone and iPad last Monday with huge upgrades, such as being able to unlock an iPhone with Face ID while wearing a mask and support for Universal Control, among other things. As we come up on a full week after the release, it’s unsurprising to see that Apple has now stopped signing the previous release: iOS & iPadOS 15.3.1.
Apple stops signing iOS 15.3.1, ending ordinary downgrades from newer iOS 15.4
