Cumulative update won't install (KB4571756) (Error 0x800f081f)

Anonymous
2020-09-11T07:31:06+00:00

I am running Windows 10 Home 2004 (Build 19041.450). Windows Update notified me that there was a cumulative update available to install (2020-09 Cumulative Update for Windows 10 Version 2004 for x64-based Systems (KB4571756)). When I told it to install the update, it will download and go up to "Installing - 100%" and then just show this error: 

I've tried the following in an attempt to fix the error:

  • Run "sfc /scannow" in an elevated command prompt
  • Run "DISM.exe /Online /Cleanup-Image /RestoreHealth /Source:<Source of clean Windows 10 2004 ISO created using Windows Media Creation Tool> /LimitAccess" in an elevated command prompt
  • Uninstall and reinstall NET framework 3.5 from "Turn Windows features on or off" in Control Panel
  • Manually download the specific update from the Microsoft Update Catalog and install it
  • Stop the Windows Update service and delete the Windows Update cache located in "%SystemRoot%\SoftwareDistrubution", then restart the service

Obviously, none of these worked so I'm looking for any other solutions to this problem. Any help is appreciated.

Windows for home | Windows 10 | Windows update

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  1. Sumit 44,306 Reputation points Volunteer Moderator
    2020-09-14T15:58:25+00:00

    No, a Reset removes all the apps and files(depending on which option you select). A repair install keeps most of the settings, all apps and files. It should fix the issue usually, and there is no harm in trying. Step 6 is what is the easiest one to do and the whole process is automatic.

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  2. Anonymous
    2020-09-14T18:38:37+00:00

    Same issue security update fails every time and wont allow any other updates to install i also have noticed that the 2004 update completely trashes SSD's and even mechanical hard drives as well

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  3. Anonymous
    2020-09-15T04:33:13+00:00

    So it is a buggy update. Ahh it never gets old... Windows 10 is too buggy.

    Yup Windows is always buggy

    I have surfed the web regarding error code: 0x800f091f 

    and found many possible reasons why the error code is showing up

    like

    1: Net Framework 3.5 is not installed reinstall it

    2: Automatic installing will not work 

       So tried manually installing update

    3: Restart Windows update services

    4: Some says Update files getting corrupted while downloading

       Not a working solution for me tried all  but not an valid reason behind this error code

    Upgrading my pc with MCT worked perfectly fine for some of the users I haven't faced

    any problems after installation of September patch till now

    You can wait for October Patch

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  4. Anonymous
    2020-09-15T04:35:01+00:00

    I'll check it out but I don't have high hopes since it's very likely the update is bugged (so no matter what I try, the update might still not install).

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  5. Anonymous
    2020-09-15T04:37:38+00:00

    Yeah the SSD bug can be fixed though by disabling the automatic defragging of the drive (at least I think so because presonally I've never had issues so far but heard a lot of people complaining and saying this fixed their issue). Although I must mention that for me, after every reboot, Windows tells me the drive needs optmization (like after every single reboot). And when I do click on optimze, it only runs the TRIM command and doesn't defrag it. I don't know for sure, but this might just be another bug.

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