After the release of iOS 14.4.1 on March 8, Apple stopped signing iOS 14.4, the previous version of iOS 14. Now that the software is no longer signed, it is no longer possible to downgrade from iOS 14.4.1 to iOS 14.4 if you have already upgraded your iPhone or iPad.
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Apple routinely stops signing older versions of software updates after new releases come out to encourage customers to keep their operating systems up to date.
iOS 14.4.1 was a security update that resolves 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 for people to download, but Apple has also made iOS 14.5 available to developers and public beta testers for testing purposes. iOS 14.5 is one of the biggest updates to iOS 14 to date, introduces a feature for unlocking a iPhone when wearing a mask with an Apple Watch, adds support for Dual-SIM 5G, introduces compatibility with the latest game controllers and more.