Apple перестала подписывать iOS 14.4.1. Установить эту прошивку не получится.
Теперь актуальная версия — iOS 14.4.2. В ней исправили критические уязвимости в системе.
Following the release of iOS 14.4.2 on March 26, Apple has stopped signing iOS 14.4.1, the previously available version of iOS 14. With iOS 14.4.1 no longer being signed, it is not possible to downgrade to iOS 14.4.1 from iOS 14.4.2 if you've already updated your iPhone or iPad. Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers to keep their operating systems up to date.

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