By Tim Hardwick
Apple has stopped signing iOS 18.1.1, preventing iPhone users who updated to iOS 18.2 from downgrading to that version of iOS. Apple released iOS 18.2 a week ago, on December 11.
Apple often stops signing older versions of iOS, usually within a week or two of a new version being released. When an update is no longer signed, it can't be installed on an iPhone due to server-side software verification.
This policy encourages users to keep their operating systems up to date, ensuring they have the latest security improvements. Apple also stopped signing iOS 17.7.2 on Wednesday.
The iOS 18.1.1 update brought important security fixes but no other notable changes. In contrast, the iOS 18.2 update brought several new Apple Intelligence features to compatible iPhones. You can find all the details in our detailed guide.
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