A week after the release of iOS 26, Apple has stopped signing iOS 18.6.2. So, you can no longer downgrade your iPhone from iOS 26 to iOS 18.

This move is standard practice for Apple. It usually stops signing older iOS builds shortly after a major update goes public.

Generally, iPhone owners stick to the newest iOS release. But if bugs crop up or changes cause issues, some may choose to downgrade to an earlier version. iOS 26 brings a major visual revamp with the Liquid Glass UI. And given the radical interface changes, some users may not like it and would want to return to iOS 18.

Sadly, that window is no longer open, as Apple has stopped signing iOS 18.6.2 -- the latest stable release of iOS 18. Additionally, the company is no longer signing iPadOS 18 and tvOS 18.6.

If you've already rolled back to iOS 18, you're in the clear. Your iPhone can stay on iOS 18.6.2 for as long as you'd like. Plus, Apple will continue pushing major security updates to iOS 18 for the next few months.

Hopefully, that window gives the company enough time to fix the lingering complaints about Liquid Glass. That way, iOS 18 users can eventually move to iOS 26 with confidence.

Even if Liquid Glass isn't to your taste, iOS 26 still makes a strong case for upgrading. The update is packed with meaningful additions, from deeper home screen customization and themed backgrounds in Messages to useful tools like Call Screening, Hold Assist, and more.

If you've already updated to iOS 26 and find yourself unhappy with Liquid Glass or other quirks, it's too late to roll back. The smart move now is to wait it out. Apple typically refines new features and fixes rough edges quickly in point releases like iOS 26.1 or 26.2. Those incremental updates often smooth the experience without making you wait for the next big iOS version.