Following the March 31 release of iOS 15.4.1, Apple has stopped signing iOS 15.4, the first available version of iOS that first came out in March. Since iOS 15.4 is no longer being signed, it is not possible to downgrade to that version of iOS after you have installed iOS 15.4.

iOS 15
Apple regularly stops signing older versions of software updates after new releases arrive to encourage customers to keep their operating systems up to date, so it’s not uncommon that iOS 15.4 is no longer signed. are.

iOS 15.4 was a major update that included support for unlocking the iPhone while wearing a mask, new emoji characters, universal controls on the iPad, and more.

iOS 15.4.1 added a fix for the battery drain issue on the iPhone, but more importantly, it addressed the AppleAVD issue that could allow an application with kernel privileges to execute arbitrary code. Apple stated that this exploit can be actively exploited, so it’s a good idea to update to iOS 15.4.

Apple has also stopped signing the tvOS 15.4 and HomePod 15.4 software.

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