Apple stops signing iOS 15.3.1, ending ordinary downgrades from newer iOS 15.4

Downgrade iOS 15

Following a rigorous beta period, Apple unleashed its iOS & iPadOS 15.4 software updates for iPhone and iPad last Monday with huge upgrades, such as being able to unlock an iPhone with Face ID while wearing a mask and support for Universal Control, among other things. As we come up on a full week after the release, it’s unsurprising to see that Apple has now stopped signing the previous release: iOS & iPadOS 15.3.1.

Latest futurerestore update fixes issue affecting A14 devices on iOS 15, otherwise known as ‘A14 Curse’

With the news of an iOS & iPadOS 15.0-15.1.1-compatible kernel exploit being released, many iPhone and iPad users who’ve been wanting to jailbreak their handset have subsequently started seeking ways to upgrade to iOS or iPadOS 15.1 or 15.1.1 while they still can. While DelayOTA can be a solid option for anyone who hasn’t saved .shsh2 blobs, those who have can alternatively use futurerestore to update to these firmware versions.

How to update non-jailbroken iPhones & iPads to unsigned firmware with DelayOTA

It’s not uncommon for people to lose their jailbreaks, and as we always say, those who aren’t jailbroken should always stay on the lowest possible firmware to ensure jailbreak eligibility. This is good in practice, but sometimes jailbreaks drop for newer versions of iOS or iPadOS than what you’re currently running, and when Apple stops signing that newer firmware, you might not be able to update to it before jailbreaking.