September 23, 2025: Apple has officially stopped signing the iOS 18.6.2 update, meaning iPhone users who have upgraded to the new iOS 26 can no longer revert back to the previous version. This change comes just a week after the launch of iOS 26.
What Does “Stopping Signing” Mean?
When Apple “signs” an iOS version, it means the company approves that software for installation via its servers. This verification is necessary for installing or downgrading to a specific iOS version. Without Apple’s signature, the installation is blocked.
By stopping the signing of iOS 18.6.2, Apple is preventing users who have moved to iOS 26 from rolling back to the older, possibly more familiar version of iOS. This move ensures devices run the latest, most secure software, but it also means users need to be sure before upgrading, as reversing the process is no longer possible.
This restriction is not limited to iPhones. Apple has also stopped signing iPadOS 18.6.2 and tvOS 18.6, preventing iPad and Apple TV users from downgrading after upgrading to their latest software versions.
What This Means for You
If you haven’t updated your device yet, you can still stay on iOS 18. But once you move to iOS 26, you will have to stick with it, adapting to its new design and features.
Apple’s usual practice of stopping signing older versions aims to improve device security and provide a consistent user experience across all devices by limiting vulnerabilities from outdated software.
What’s New in iOS 26? Apple Locks iPhones to iOS 26, No Going Back Now
iOS 26 introduces a fresh look and new features, including Apple’s new design style called ‘Liquid Glass’. This design gives apps, icons, and controls a translucent, glass-like appearance, creating a smooth and unified feel throughout the system.
Key changes include:
- Dynamic Lock Screen: Time display adapts to your wallpaper, and notifications shift to keep your photo’s main subject visible.
- 3D Effects: Subtle depth effects activate when you move your device.
- Home Screen Icons: Redesigned with options for light, dark, colored, or translucent styles.
- Control Centre and In-App Controls: These change color and shape fluidly to blend with the background and content, making the overall experience more seamless.
To do or not to upgrade to iOS 26
While the new iOS 26 brings impressive changes and AI-powered features, think carefully before upgrading. Once you switch, there’s no going back to iOS 18.6.2. If you value stability or prefer the older interface, consider holding off until you’re ready to fully embrace the new version.
