Apple has closed the iOS 16.3.1 verification channel after releasing the iOS 16.4.1 update yesterday, which means iPhone users can no longer downgrade to this version of the system. For now, iOS 16.4, iOS 16.4.1, and iOS 16.5 beta versions are still available for normal installation.
Apple iOS 16.3.1 is a minor update released on February 13 that contains a few bug fixes, security improvements, and crash detection optimizations for iPhone 14 series models. Apple typically stops signing older versions of iOS shortly after a new iOS release to encourage users to keep the system up to date.
It’s predicted that the iOS 16.4 verification channel may be closed later this month, so iPhone users who want to downgrade to this version need to hurry.
