Apple Halts Signing of iOS 26.4, Preventing Downgrades to Previous Version
Apple has ceased signing iOS 26.4, effectively preventing users from downgrading to this version after updating to iOS 26.4.1. This move aligns with Apple’s standard practice of stopping the signing of older iOS versions shortly after releasing new updates, ensuring that devices run the most secure and up-to-date software.
The signing process is a server-side verification that Apple performs when users download and install iOS updates. Once a version is no longer signed, it cannot be installed on devices, thereby blocking any attempts to revert to previous versions. This approach helps maintain device security by preventing the installation of outdated software that may contain vulnerabilities.
iOS 26.4.1, released a week prior to this change, addressed issues related to iCloud syncing and enhanced Stolen Device Protection for enterprise devices. By discontinuing the signing of iOS 26.4, Apple encourages users to adopt the latest updates, which often include critical security patches and performance improvements.
For users who have already updated to iOS 26.4.1, downgrading to iOS 26.4 is no longer an option. Apple’s policy of stopping the signing of older iOS versions typically occurs about a week after a new release, underscoring the company’s commitment to user security and software integrity.
