STATUS_SECUREBOOT_POLICY_UNKNOWN 0xC0430009

Hex 0xC0430009 · Decimal -1069350903 · Type NTSTATUS

WINDOWS

The Supplemntal Policy is not recognized on this device.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

STATUS_SECUREBOOT_POLICY_UNKNOWN is a Windows error code (NTSTATUS 0xC0430009) reported by Windows. Its official message is: “The Supplemntal Policy is not recognized on this device.”

How to fix STATUS_SECUREBOOT_POLICY_UNKNOWN

  1. Reboot once — many one-off system codes disappear with a clean restart
  2. Repair system files: 'sfc /scannow' then 'DISM /Online /Cleanup-Image /RestoreHealth'
  3. Find the source in Event Viewer → System: filter for this exact code and open its provider link

Related errors

STATUS_SECUREBOOT_POLICY_MISSING_ANTIROLLBACKVERSIONSTATUS_SECUREBOOT_POLICY_NOT_AUTHORIZEDSTATUS_SECUREBOOT_POLICY_ROLLBACK_DETECTEDSTATUS_SECUREBOOT_POLICY_NOT_SIGNEDSTATUS_SECUREBOOT_FILE_REPLACEDSTATUS_SECUREBOOT_PLATFORM_ID_MISMATCHSTATUS_SECUREBOOT_POLICY_UPGRADE_MISMATCH

Source: Microsoft ntstatus.h

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