Apple stops iOS 15.3.1 signatures

A few days after the release of iOS 15.4, Apple blocks iOS 15.3.1 signatures, preventing downgrades to previous versions.

If you have installed iOS 15.4, with signature blocking, you can no longer downgrade the operating system to iOS 15.3.1. This interruption will also have repercussions on possible jailbreaks, since an unlock of iOS 15.3.1 would now be useless for those who have already updated to a later version.

We remind you that iOS 15.3.1 has fixed some important bugs, including some related to security.

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