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.

Your ISO may have been an older version but when you run setup.exe and say check for updates, it patches the ISO with the new updates. You may have installed the older version on your new build.

It is same ISO I used to install win10 on my new built system, if "already comes with the September patch pre installed" then why was it offered in updates and failed?

Yes the in place upgrade works because it already comes with the September patch pre installed. I think the it failed the first time I did it because I didn't check for updates in the installer. Once the September patch is installed the October patch automatically gets installed without any errors. So as far as I know, an in-place upgrade is the only solution to this problem.

OK I broke down and did the clean install with Win10 ISO, I checked to keep my files and it downloaded updates, after everything was done I noticed it didn't offer KB4571756 but KB4576945 which was never offered before and it installed fine, after reboot checked again for updates and the KB4577063 was still being offered so I installed that one too, I did notice that before with failed installs, that it would get to 44% then jump to 100% and kicked out error. This time however it took a lot longer and showed progress of 44% 75% etc and so on till it was done, required a reboot. I now have both KB4571756 and KB4577063 installed, so I can confirm that the reinstall indeed works, without any ill affects to OS, besides now I have to remove the recent folders and check what else it might have changed and apply those settings. I am just happy it got them installed and now can image my system. I want to thank the others who replied and tried to help and offering help, most I had already found from other sites, my main posting here was to be added to list with others having problems.

This is the "defrag" bug, not the "TRIM" bug. And trimming an SSD doesn't cause any significant wear and tear. As Don Cuthbert said, the TRIM bug was that the SSD showed up as not being trimmed even after just being trimmed. The defrag bug is different where the SSD is being defraged (unlike an HDD, SSDs don't need defraging, this actually reduces their write cycles and thus lifespan).

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

Anonymous

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.

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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217 answers

Anonymous

2020-10-06T06:30:25+00:00

Your ISO may have been an older version but when you run setup.exe and say check for updates, it patches the ISO with the new updates. You may have installed the older version on your new build.
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Anonymous

2020-10-06T06:19:15+00:00

It is same ISO I used to install win10 on my new built system, if "already comes with the September patch pre installed" then why was it offered in updates and failed?
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Anonymous

2020-10-06T05:58:56+00:00

Yes the in place upgrade works because it already comes with the September patch pre installed. I think the it failed the first time I did it because I didn't check for updates in the installer. Once the September patch is installed the October patch automatically gets installed without any errors. So as far as I know, an in-place upgrade is the only solution to this problem.
Was this answer helpful?

0 comments No comments
Anonymous

2020-10-06T05:23:23+00:00

OK I broke down and did the clean install with Win10 ISO, I checked to keep my files and it downloaded updates, after everything was done I noticed it didn't offer KB4571756 but KB4576945 which was never offered before and it installed fine, after reboot checked again for updates and the KB4577063 was still being offered so I installed that one too, I did notice that before with failed installs, that it would get to 44% then jump to 100% and kicked out error.

This time however it took a lot longer and showed progress of 44% 75% etc and so on till it was done, required a reboot. I now have both KB4571756 and KB4577063 installed, so I can confirm that the reinstall indeed works, without any ill affects to OS, besides now I have to remove the recent folders and check what else it might have changed and apply those settings.

I am just happy it got them installed and now can image my system. I want to thank the others who replied and tried to help and offering help, most I had already found from other sites, my main posting here was to be added to list with others having problems.
Was this answer helpful?

0 comments No comments
Anonymous

2020-10-06T04:31:06+00:00

This is the "defrag" bug, not the "TRIM" bug. And trimming an SSD doesn't cause any significant wear and tear. As Don Cuthbert said, the TRIM bug was that the SSD showed up as not being trimmed even after just being trimmed. The defrag bug is different where the SSD is being defraged (unlike an HDD, SSDs don't need defraging, this actually reduces their write cycles and thus lifespan).
Was this answer helpful?

0 comments No comments