Apple blocks downgrades to iOS 13.3.1 following release of iOS 13.4
9to5Mac -

Apple today has officially stopped signing iOS 13.3.1 following last week’s release of iOS 13.4. This means users can no longer downgrade from iOS 13.4 to iOS 13.3.1. Apple has also stopped signing iOS 12.4.5 and tvOS 13.3.1. iOS 13.4 was released to the public last week. The update included major changes such as iPad

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