Apple stops signing iOS 17.6 system, upgraded iPhone users can no longer downgrade

IT House reported on August 16 that Apple stopped signing the iOS 17.6 version system today, preventing iPhone users from downgrading to this version. Apple has released the iOS 17.6.1 update on August 8.

1. Apple regularly stops signing older versions of iOS, usually within a week or two after a new version is released.

2. When Apple stops signing an update, it can no longer be installed on iPhone due to server-side software verification checks, and users who have updated to the latest version of iOS cannot downgrade.
3. Preventing downgrades encourages users to keep their operating systems up to date and install the latest security fixes.
4. iOS 17.6 focuses on introducing security fixes, while iOS 17.6.1 includes "important bug fixes" and resolves an issue that prevented advanced data protection features from being enabled or disabled.

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