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WU_E_DM_UNKNOWNALGORITHM
WU_E_DM_UNKNOWNALGORITHM means Windows Update encountered metadata requiring an unsupported or unrecognized file-hash algorithm. It normally points to incompatible update metadata or an outdated component, not a transient network failure.
What to check
- Identify the update source and the exact metadata revision reported in the Windows Update log.
- For a managed service, verify that the server and client support the same update infrastructure and content metadata.
- Check whether the device is missing servicing updates required by the current update mechanism.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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