Apple has ceased signing iOS 26.6.2, a process that authorizes the installation of specific iOS versions on iPhones. This means that users attempting to install iOS 26.6.2 will no longer be able to verify the installation with Apple's servers.
The immediate consequence is that iPhone users currently running iOS 27 are now unable to officially downgrade to iOS 26.6.2 or any earlier iOS 26 version. This closes the window for users who might have wanted to revert to a previous operating system.
Apple typically stops signing older iOS versions to enhance security. Older software often contains known vulnerabilities that have been patched in newer releases. By preventing downgrades, Apple aims to protect users from potential exploits that could target these unpatched flaws.
While iOS 26.7 was released recently, Apple does not currently offer a restore image for it, unlike iPadOS 26.7. Users still on an earlier iOS 26 version can update to iOS 26.7 via an over-the-air update, but those on iOS 27 cannot use it to downgrade.
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Apple has stopped signing iOS 26.6.2, which means iPhone users running iOS 27 can no longer officially downgrade to any iOS 26 version. This action prevents users from installing older software that may contain unpatched security vulnerabilities.