Apple stops signing iOS 18.6, blocking downgrade from both iOS 18.6.X updates
Apple has released two software updates to iOS 18.6. Since the iPhone software update has shipped without issue, and one contained a major security patch, Apple has stopped signing the older iOS 18.6 software version. Apple stops signing versions of iOS due to security issues being disclosed in older software versions and patched in newer software versions. Apple released iOS 18.6 on July 29. The update included bug fixes, security improvements, and a fix for a performance issue with the Photo