What does Windows error code 4433 (ERROR_SECUREBOOT_REQUIRED_POLICY_FILE_MISSING) mean?

ERROR_SECUREBOOT_REQUIRED_POLICY_FILE_MISSING

ERROR_SECUREBOOT_REQUIRED_POLICY_FILE_MISSING (LRESULT 0x00001151) This Win32 error means a Secure Boot policy file required for the current configuration could not be found.

What to check for ERROR_SECUREBOOT_REQUIRED_POLICY_FILE_MISSING

• Identify whether the missing file belongs to the base policy, a supplemental policy, or a managed deployment package.
• Restore it through the supported deployment or recovery process; do not create an empty replacement file.
• Check recent cleanup, imaging, rollback, or antivirus actions that may have removed policy content.

Read-only checks for ERROR_SECUREBOOT_REQUIRED_POLICY_FILE_MISSING

Get-SecureBootPolicy | Format-List

Get-WinEvent -LogName 'Microsoft-Windows-CodeIntegrity/Operational' -MaxEvents 50

Secure Boot policy and UEFI-variable changes can affect whether a device boots. For ERROR_SECUREBOOT_REQUIRED_POLICY_FILE_MISSING, capture the current state first and use only the approved signed policy or OEM workflow for changes.

Microsoft: Get-SecureBootPolicy

Microsoft: Viewing Code Integrity events

Microsoft: Secure Boot

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