Apple has stopped signing iOS 15.0.2, which means that any device running the latest version of iOS can no longer downgrade or restore to a previous version of iOS, making it impossible for users to undo an update if they’re not happy with the changes it brings.
There are many reasons people might want to downgrade their phone, including battery life issues after installing a new software update or enjoying access to previously available features on older versions of the operating system.
The only way around this restriction is by performing what’s known as an “official” downgrading process via Apple’s developer portal – but even then, there are some caveats involved in order for it to work correctly and not cause problems with your device when you reboot.
Of course, it’s always possible to reinstall iOS via iTunes without upgrading to the latest version. However, this means you’ll need access to a PC or Mac with iTunes installed in order to complete the task – something many users don’t have available.
Apple stopped signing iOS 15.0.2 earlier this week, meaning that users can no longer downgrade to the latest version of iOS unless they have a saved SHSH blobs file for the same firmware. In fact, Apple stopped signing all previous versions of iOS shortly after it released iOS 9 – which means you’ll now need to downgrade to a version below iOS 9 if you want to revert back to an older OS. iOS 9 is now the only version of Apple’s mobile operating system that can be downloaded by users who are not running a developer preview or beta build. This effectively means that once you upgrade to a newer version of iOS – whether it’s from an over-the-air update onboard your device itself or through iTunes on a PC or Mac, you can no longer downgrade