Windows10-21H2 Upgrade – Error 0xc1900201

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I’m trying to upgrade to Win 10 21H2 but I get Error 0xc1900201 which according to my research relates to updating the system reserved partition. See https://support.microsoft.com/en-us/topic/-we-couldn-t-update-system-reserved-partition-error-installing-windows-10-46865f3f-37bb-4c51-c69f-07271b6672ac

 

I have tried to do what was detailed in the link above but it still doesn’t work.

 

Any ideas on how to fix this?

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Error 0xc1900201 is also related to file corruption so try this:

Right click cmd prompt (run as admin)
copy and paste the following:
sfc /scannow

once done (it may take a while) close the cmd prompt and restart the device.
Then try to upgrade again.

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I ran sfc /scannow and rebooted. Didn’t solve my problem.

Any other ideas anyone?

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In Command Prompt (with admin privileges) run the following:

dism /online /cleanup-image /restorehealth

Then run sfc /scannow again. The first command I mentioned can take a while to complete, and for me at least tends to stall around the 52% mark each time – just give it time.

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