Apple stops signing iOS 26.5.1, blocking downgrades after security update
Apple has stopped signing iOS 26.5 and iOS 26.5.1, preventing users from downgrading to these versions after releasing iOS 26.5.2 on June 29 with a critical security fix. This is standard practice for Apple, which typically stops signing older iOS versions once newer updates are confirmed stable. The article notes Apple gave iOS 26.5.1 a full week before closing downgrade access.
Key quotes
Apple is no longer signing iOS 26.5 and iOS 26.5.1, preventing downgrades to these software versions from newer releases.
Apple regularly cuts off versions of iPhone software after newer updates become available.
The company stops signing releases once updates are proven to be generally free of major issues.
From the article
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