What does HRESULT 0x8024601A (WU_E_DM_FALLINGBACKTOBITS) mean?

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Windows Update will continue the content transfer by falling back to BITS.

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WU_E_DM_UNAUTHORIZED_MSA_USER	WU_E_DM_DOWNLOAD_VOLUME_CONFLICT

WU_E_DM_FALLINGBACKTOBITS

WU_E_DM_FALLINGBACKTOBITS is normally an informational transition: the update download will continue through Background Intelligent Transfer Service. It should be read together with the subsequent BITS outcome, not treated as a final failure on its own.

What to watch next

Check the next DownloadManager and BITS-related entries for the actual completion or error result.
Ensure that BITS can run and the device retains a usable network path during the background transfer.
For repeated fallback loops, investigate the original download method and any proxy or content-delivery differences.

Microsoft: Windows Update error reference

Microsoft: Background Intelligent Transfer Service (BITS)

Microsoft: Windows Update log files

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