Apple no longer signed iOS 18.6, making downshifts from iOS 18.6.2 or iOS 18.6.1 to iOS 18.6 Impossible. IOS 18.6.1 came out just over a week ago, quickly followed by iOS 18.6.2 Wednesday.
Apple often stops signing an old version of iOS, usually in a week or two after the release of a new version. When an update is no longer signed, it cannot be installed on a iphone due to a software verification verification on the server side.
By no longer signing software version, Apple guarantees that customers have the latest safety improvements and are not vulnerable to known attacks.
Updating the iOS 18.6.1 update of Apple is monitoring blood oxygen in the United States for Apple Watch Series 9, Apple Watch Series 10 and Apple Watch Ultra 2 Running Watchos 11.6.1, which was published simultaneously. This was quickly followed by iOS 18.6.2, providing significant security fixes.
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