Overview
- Apple's signing servers no longer authorize iOS 26.4 installs, which prevents any downgrade from iOS 26.4.1 to that version.
- MacRumors first noted the change and 9to5Mac reported it as well, confirming the signing window for iOS 26.4 is closed.
- Apple released iOS 26.4.1 last week with brief notes that it provided bug fixes and with no security CVE entries on its website.
- Users reported that iOS 26.4.1 repaired an iCloud syncing issue, restoring CloudKit change updates across devices.
- Apple often closes older builds when a newer version is stable or fixes serious flaws, so anyone planning a rollback now needs to stay on 26.4.1.