Apple is no longer signing iOS 18.6, making downgrades from iOS 18.6.2 or iOS 18.6.1 to iOS 18.6 impossible. iOS 18.6.1 was released a little over a week ago, swiftly followed by iOS 18.6.2 on Wednesday.
Apple often stops signing an older version of iOS, usually within a week or two after a new version is released. When an update is no longer signed, it can’t be installed on an ‌iPhone‌ due to a server-side software verification check.
By no longer signing a software version, Apple ensures that customers have the latest security improvements and are not vulnerable to known attacks.
Apple’s iOS 18.6.1 update re-enables blood oxygen monitoring in the United States for the Apple Watch Series 9, Apple Watch Series 10, and Apple Watch Ultra 2 running watchOS 11.6.1, which was released concurrently. That was quickly followed by iOS 18.6.2, providing important security fixes.
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