If you updated to iOS 27, there’s no going back. Apple has stopped signing iOS 26.6.2, which means the version of iOS 26 most people were running before iOS 27 launched can no longer be installed.
iOS 27 came out a week ago, and the downgrade window closed quietly sometime after that. Anyone who hasn’t made the jump yet can still stay on iOS 26 for now, but once you install iOS 27, there’s no route back to the old version.
Apple Closed the iOS 27 Downgrade Window a Week After Launch
The situation is a bit more specific than a blanket “no downgrades” rule. iOS 26.7, the version Apple released alongside iOS 27 for anyone not ready to upgrade, was never an option for going back either. It shipped as an over-the-air update with no restore file, so there was never a way to reinstall it manually in the first place.
That leaves iOS 26.6.2 as the last version with a signed restore file, and now that Apple has pulled its signature, that door is shut too. A step-by-step guide for making that jump went up right after iOS 27 launched, and it no longer works, since the method it walked through depended on Apple still signing iOS 26.6.2.
If iOS 27 has given you trouble, the fix from here is working through the update itself rather than trying to escape it. Check our list of the most common iOS 27 problems and fixes that most people are running into.
Every iOS version stays “signed” for a limited stretch after a new one ships. Signed software can pass a server-side check Apple runs whenever a device tries to install it, and once Apple stops signing a version, that check fails automatically and the install won’t go through.
Apple does this on purpose, leaving an old, less secure version of iOS installable indefinitely would give people, and attackers, an easy way to dodge fixed vulnerabilities by rolling back to a version those fixes never reached.
This isn’t new behavior either, Apple has followed the same pattern with nearly every major release. iOS 27 launched September 14, and this time the signing window lasted about a week.
