Following last week’s release of iOS 26.4.1, Apple today stopped signing iOS 26.4. Here’s what that means.

Apple no longer signing iOS 26.4 installs

As spotted by MacRumors, Apple stopped signing iOS 26.4 earlier today, which means that it is now impossible to downgrade from iOS 26.4.1 to the previous system version.

Apple usually stops signing older iOS versions for one of two reasons: either the current release is deemed stable enough, or when the updated system version addresses serious security flaws present in earlier builds.

When Apple rolled out iOS 26.4.1, the release notes mentioned only that the build “provide(d) bug fixes for your iPhone.” Likewise, the company’s security website said there were no published CVE (essentially, unique identifying codes for security bug fixes) entries for iOS 26.4.1.

Following the release of iOS 26.4.1, users noticed that the update fixed an iCloud syncing bug, but that’s the extent what’s currently known about the system,

Be that as it may, if you had been thinking about downgrading from iOS 26.4.1 to iOS 26.4 for whatever reason, it looks like you missed your chance.

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