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

Apple periodically stops signing older versions of iOS, usually within a week or two of a new version being released. When Apple stops signing an update, that update can no longer be installed on an iPhone due to server-side software validation checks, so those who have already updated to the latest version of iOS cannot downgrade.

Preventing downgrades encourages users to keep their operating systems up to date and install the latest security fixes.

According to previous reports by IT Home, iOS 17.6 focuses on introducing security fixes.And iOS 17.6.1 includes "important bug fixes", and resolves an issue in which the Advanced Data Protection feature cannot be enabled or disabled.