06-27-2026, 12:51 PM
@all,
Now that UEFI firmware checks the Security Version Number (SVN) of boot files during startup, a practical issue arises: Windows security updates may raise the minimum allowed SVN recorded in the firmware, causing any Emergency Disk created before that update to become unbootable because its boot loader is too old. This means we can no longer guarantee that an Emergency Disk will always boot properly with Secure Boot enabled. In such cases, users must either recreate the Emergency Disk or temporarily disable Secure Boot to boot from the old one.
Best regards,
Now that UEFI firmware checks the Security Version Number (SVN) of boot files during startup, a practical issue arises: Windows security updates may raise the minimum allowed SVN recorded in the firmware, causing any Emergency Disk created before that update to become unbootable because its boot loader is too old. This means we can no longer guarantee that an Emergency Disk will always boot properly with Secure Boot enabled. In such cases, users must either recreate the Emergency Disk or temporarily disable Secure Boot to boot from the old one.
Best regards,