Apple stops signing iOS 17.5.1, upgraded iPhone users can no longer downgrade

On August 6, Apple issued an announcement today, announcing that it would stop signing the iOS 17.5.1 system, which means that users who have upgraded to a higher version will no longer be able to downgrade themselves.

1. Apple typically blocks users from installing older versions of iOS to encourage customers to keep their operating system up to date and to prevent downgrading to older, less secure iPhone OS versions.

2. Note: Apple originally released the official iOS 17.5.1 update on May 21, and then re-released the iPadOS 17.5.1 update for iPad 10 users on June 4.
3. This update only fixes some important bugs and resolves an issue where a corrupted database could cause deleted photos to reappear in the Photos library in rare cases.

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