After the release of iOS 14.4.1 on March 8, Apple has stopped signing iOS 14.4, the previous version of iOS 14. With the software no longer signed, it is no longer possible to change version of 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 previous versions of software updates after new versions come out to encourage customers to keep their operating systems up to date.
iOS 14.4.1 was a security fix update that fixed 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 most important updates of OSiOS 14 so far, which introduces a feature to unlock an iPhone when wearing a mask with an Apple Watch, adds Dual-SIM 5G support, introduces compatibility with the latest game controllers and more.