Microsoft confirms systems without updated Secure Boot certificates will boot normally but lose some security protections.

Microsoft has recently begun replacing expiring Secure Boot certificates on eligible Windows 11 systems running 24H2 and 25H2 ...

The consequences of missing the certificate refresh aren’t limited to a warning message. A summary includes several functional failures: Secure Boot may stop working, systems may no longer be able to ...

Microsoft urges Windows Server admins to prepare for Secure Boot certificate updates. Expiring 2011 Secure Boot certificates in June 2026 require proactive remediation. Updated firmware trust chains ...

Make sure you've updated before the deadline.

In the early hours of Wednesday this week, Microsoft released the preview update for Windows 11. It is quite extensive in February. Among other things, the update brings new Secure Boot certificates ...

Microsoft on Monday released a Secure Boot update ahead of the expiry of a root certificate first issued in 2011, warning users to install the patch to avoid potential startup problems when the ...

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The boot issue, which Microsoft previously investigated and linked to failed December 2025 updates, affected a limited number of commercial Windows 11 devices running versions 25H2 and 24H2.