IOS 15.7.4 build 19H321

iOS 15.7.4 build 19H321 is the official RTM build of iOS 15.7.4, which was released to the public on 27 March 2023. Prior to that, it was released six days earlier as the official Release Candidate build to Apple developers and public beta testers. It is only available for devices that are incapable of running iOS 16 or newer.

This build is a security update that patches several existing vulnerabilities.