ERROR_UNKNOWN_PATCH 0x8007066F

Error code 1647 · HRESULT 0x8007066F

WINDOWS

The update is not applied to this product.

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

ERROR_UNKNOWN_PATCH is a Windows error code (system error 1647, returned as HRESULT 0x8007066F) reported by Windows. Its official message is: “The update is not applied to this product.”

How to fix ERROR_UNKNOWN_PATCH

  1. Run the Windows Update troubleshooter (Settings → System → Troubleshoot → Other tools)
  2. Reset update components: stop 'wuauserv' and 'bits', clear C:\Windows\SoftwareDistribution, restart both services
  3. Verify system file integrity with 'sfc /scannow'

Related errors

ERROR_PATCH_REMOVAL_UNSUPPORTEDERROR_PATCH_NO_SEQUENCEERROR_INSTALL_REMOTE_PROHIBITEDWU_E_SERVICE_STOPSL_E_INVALID_PRODUCT_KEY0xC004F0740xC004C0030xC004C008

Source: Microsoft WinError.h

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