Apple no longer signs iOS 18.5, which means that iPhone users who have upgraded to iOS 18.6 can no longer go to the previous version of iOS. IOS 18.6 was released a little over a week ago.

“Signing” is a server side check Check that Apple does when a new version of iOS is downloaded from a ‌iphone‌. An update cannot be downloaded and installed unless it passes the verification verification, and the insignificant process prevents customers from installing obsolete versions of less secure iOS.

Apple generally ceases to sign older software approximately a week after having published an update, and this guarantees that customers have the latest safety improvements and are not vulnerable to known attacks.

IOS 18.6 focused on security updates, and added more than 20 vulnerabilities.

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