HRESULT 0x80240061 (WU_E_FILETRUST_SHA2SIGNATURE

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Windows Update could not find a valid SHA-2-or-stronger signature on a Microsoft-signed payload.

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WU_E_IDLESHUTDOWN_OPCOUNT_SERVICEREGISTRATION	WU_E_UPDATE_NOT_APPROVED

WU_E_FILETRUST_SHA2SIGNATURE_MISSING

WU_E_FILETRUST_SHA2SIGNATURE_MISSING means signature validation did not find the required SHA-2+ signature on the signed payload. Treat this as a trust-validation problem, not as a reason to disable code-signing checks.

How to investigate

Verify that the payload came from the intended update source and was not changed by a cache, proxy, or security product.
Check the device’s servicing level, root certificates, system time, and relevant update prerequisites.
Keep the original error context because a preceding certificate or transport error may explain the signature result.

Microsoft: Windows Update error reference

Microsoft: Windows Update log files

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