Oliver Haslam·

Apple Is No Longer Signing iOS 15.3.1, Leaving iOS 15.4 As The Only Option

Apple has stopped signing the iOS 15.3.1 software which means that nobody is able to install it on their iPhones. The same situation applies to the iPadOS 15.3.1 update, too.

As a result, the iOS 15.4 and iPadOS 15.4 updates are the only ones available to people who restore their iPhones and iPads as of today.

Apple released iOS 15.4 to the public earlier this month after a long beta program that saw various versions made available to both developers and those on the public beta program.

While Apple doesn’t normally say why it has stopped signing older versions of its software, there are a couple of potential reasons. Often it’s related to security fixes, with Apple ensuring that people can’t downgrade iPhones to allow them to take advantage of a security issue that was patched in a newer release.

Another potential reason is to ensure that everyone is using a version of the software that includes the latest features and APIs.

The iOS 15.4 and iPadOS 15.4 updates added support for new emojis, Face ID while wearing a mask, and more. Notably, the update also fixed some WebKit vulnerabilities and it’s those fixes that are likely to be the reason behind the removal of iOS 15.3.1. Apple also stopped signing iOS 15.3 not too long after iOS 15.3.1 was released, too.

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