News on May 29th, Apple issued an announcement today, announcing that it would stop signing iOS 17.5, which means that users who have already upgraded cannot downgrade again. Apple typically blocks users from installing older versions of iOS to encourage customers to keep their operating systems up to date and to prevent downgrading to older, less secure iPhone operating system versions. Note: Apple released the official version updates of iOS 17.5 and iPadOS 17.5 on May 14. The National Bank version update content shows that this update launches a new "Rainbow Glow" wallpaper for the lock screen, and includes other features for iPhone. Feature enhancements, bug fixes, and security updates. The iOS 17.5.1 update released by Apple last week can still support signing. It mainly provides some important bug fixes and solves the rare case where database corruption causes deleted photos to be re-appeared in "Photos" Issues in the gallery. Related reading: "Apple iOS/iPadOS 17.5 official version released, EU users can download applications directly from the website" "Apple iOS 17.5.1 official version released: Fix the "resurrection" problem of deleted photos"
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