Article Title: Apple Halts Signing of iOS 26.2, Preventing Downgrades from iOS 26.2.1
Apple has ceased signing iOS 26.2, effectively preventing users who have upgraded to iOS 26.2.1 from reverting to the previous version. This move follows the recent release of iOS 26.2.1, which introduced support for AirTags 2.
In Apple’s ecosystem, signing refers to a server-side verification process that authenticates iOS versions during installation. Only software that passes this verification can be installed on an iPhone. Once Apple stops signing a particular iOS version, users can no longer install or downgrade to that version.
Typically, Apple discontinues signing older iOS versions about a week after a new release. This practice ensures that devices run the latest software, benefiting from up-to-date security patches and features. By preventing downgrades, Apple aims to protect users from potential vulnerabilities present in earlier software versions.
In addition to iOS 26.2, Apple has also stopped signing several older iOS versions for devices that cannot upgrade to iOS 26. These include iOS 12.5.7, iOS 15.8.5, iOS 16.7.12, and iOS 18.7.3. Newer versions, such as iOS 12.5.8, iOS 15.8.6, and iOS 18.7.4, were released last week, with an updated version of iOS 16 becoming available today.
This strategy underscores Apple’s commitment to maintaining a secure and efficient user experience by encouraging the adoption of the latest software versions.
