After the release of iOS 14.4.1 on March 8, Apple stopped signing iOS 14.4, the previous version of iOS 14. With software that is no longer signed, it is no longer possible to switch from iOS 14.4.1 to iOS 14.4 if you’ve already updated your iPhone or iPad.
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Apple typically stops signing older versions of software updates after new releases appear to encourage customers to keep their operating systems up to date.
iOS 14.4.1 was a security fix update that addressed a WebKit vulnerability that could allow maliciously crafted web content to execute code.
iOS 14.4.1 is the current publicly available version of iOS that people can download, but Apple has also provided iOS 14.5 to developers and public beta testers for testing purposes. iOS 14.5 is one of the biggest updates to OSiOS 14 to date, introducing a feature to unlock an iPhone when wearing a mask with an Apple Watch, adding Dual-SIM 5G support, introducing compatibility with the latest game controllers, and many others.