Apple blocks iOS 15.4 signatures

Following the release of iOS 15.4.1, Apple blocked iOS 15.4 signatures preventing downgrade to previous versions.

If you have installed iOS 15.4.1, with signature blocking, you can no longer downgrade the operating system to iOS 15.4. This interruption will also have repercussions on possible jailbreaks, since an unlock of iOS 15.4 would now be useless for those who have already updated to a later version.

Remember that iOS 15.4 brought several new features, such as the ability to unlock the iPhone via Face ID even with a mask worn.

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