IT Home reported on April 24th that Apple has stopped signing up for iOS 18.4 one week after releasing the iOS 18.4.1 update, and iPhone users who upgrade to iOS 18.4.1 cannot downgrade back to iOS 18.4.
IT Home has learned that the iOS 18.4.1 update provides important bug fixes and security updates, and resolves rare issues that cause wireless CarPlay in some vehicles to fail to connect.
IOS 18.4 was released on April 1st, and this update includes the Apple Vision Pro app, new Apple Intelligence features and language support for notifications, recipe functionality for Apple News+subscribers, and feature optimizations for multiple photo apps.
Apple will periodically stop signing older versions of iOS, usually within one or two weeks after the release of a new version. When Apple stops signing updates, due to server-side software verification checks, the update will no longer be able to be installed on iPhone, so users who have already updated to the latest version of iOS cannot downgrade.
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