Windows 10 KB5078885 ESU out with Secure Boot 2023, replacing expiring Secure Boot certificates from 2011. But it's a staged roll out.

When installing a fresh copy of Windows 10, you typically use a USB flash drive to launch the "Windows Setup" wizard to continue with the installation process. However, on a device that has a Unified ...

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

You may see the “Secure Boot can be enabled when System in User Mode” error message while enabling the Secure Boot on your device. If you want to install Windows ...

In June 2025, Microsoft announced that, in June 2026, it would begin deprecating Secure Boot certificates of Windows systems from 2011, which were superseded by their 2023 counterparts.