Apple on Monday stopped signing iOS 15.4.1, just a week after iOS 15.5 was released to the public. As a result, iPhone and iPad users can no longer downgrade from iOS 15.5 to iOS 15.4.1, which impacts users who jailbreak their devices.
iOS 15.4.1 was released on March 31 with fixes in general, including fixing a bug that made the battery drain faster. On May 16, Apple released iOS 15.5 – which comes with enhancements to Apple Cash and new features in the Podcasts app.