Apple stops signing iOS 17.3.1, upgraded iPhone users can no longer downgrade

According to news on March 13, Apple announced today that it will stop signing the iOS 17.3.1 update, which means that users who have already upgraded cannot downgrade again.

Note: Apple released the iOS 17.3.1 update on February 9. The update is not significant. The official log states that this update focuses on fixing the issue where text may appear during typing on the iPhone. Unintentional copying or overlapping issues. Apple released iOS 17.4 on March 5, which is currently the only iOS version that supports signing. It mainly introduces new Emoji and adjusts App Store, Safari, etc. for the European market. 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. Related reading: "Apple iOS/iPadOS 17.3.1 released: Fix the problem of accidental copying or overlapping of text while typing"

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