Earlier this month, Apple rolled out the iOS 26.6.2 update to eligible iPhones, preparing them for the iOS 27 stable release, which was subsequently seeded the following week. Now, the Cupertino brand has decided to make downgrading to iOS 26 impossible for those on iOS 27 builds.
Apple Stops Signing iOS 26.6.2 to Disable Downgrades
Confirmed by MacRumors analyst Aaron on X, Apple has now unsigned iOS 26.6.2. This prevents stable iOS 27 users from installing the previous build of iOS on their iPhones.
Apple is usually swift when it comes to barring iPhone users from rolling back to older versions, thus preventing them from installing less stable and secure iOS builds.
For context, signed software on Apple iPhones usually means that it has passed server-side verification and that it can now be downloaded. This signing process is important to help iOS updates install and run on iPhones without any hiccups.
However, it also makes the software prone to downgrades. Even though the signed build is not visible to the user, they will still be able to use macOS Finder on a Mac or the Apple Devices app on a Windows PC to install previous iOS builds.
Hence, Apple usually unsigns its older iOS versions to maintain update continuity and block users from unnecessary downgrades. This also keeps users relatively safer from falling victim to cyberattacks, as threat actors can exploit vulnerabilities in older software versions.
The iOS 26.6.2 update is the latest version to be unsigned and Apple has previously unsigned builds like iOS 26.2, iOS 12.5.7, iOS 15.8.5, iOS 16.7.12 and iOS 18.7.3.
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