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Core Isolation disabled after updating to 20H1 RRS feed

  • Question

  • today I updated from 1909 to 2004, and out of curiosity I looked into the settings app if for any changes.
    I noticed that "Device Security" - "Core Isolation" was turned off.
    I am pretty sure that was turned on before the update.
    Trying to re-enable it failed, blaming two drivers:
    BrUsbSib.sys (older Brother MFC Printer / Scanner)
    xusb21.sys (possibly XBox controller)
    While I had the Brother Printer, it was never connected via USB, and my current one most certainly is not.
    I had an XBox controller connected, but did not use it for some time.
    I removed the drivers by using "pnputil.exe -d oemxxx.inf" from an elevated command prompt (figuring that removing these 2 drivers will probably not wreck the system, even when they were used),
    then I could re-Enable Core isolation again. (was still enabled after reboot).

    So my question is: did anyone else see Core Isolation silently being disabled by the Windows 10 20H1 update?
    Is this a known Issue?
    Friday, May 29, 2020 8:19 PM

All replies

  • It might be compatibility issue with new build , make sure report this issue through Feedback Hub app.
    Saturday, May 30, 2020 4:00 PM
  • Hi EckiS, 

    It is not a known issue.

    Tested on my computer from Windows 10 1909 to Windows 10 2004 with core isolation enabled, the option will not disabled after update. 

    However, according to my research, Core Isolation was turn off by default during upgrade of Windows. But the feature is enabled by default after installation. If some of drivers installed on your computer is incompatibility with new system, it will remainder you to turn off Memory Integrity or turn it off during upgrade. The workaround is upgrade drivers or turn it off before upgrade.

    For details, please check:

    What are core isolation and memory integrity in Windows 10?

    Updating to Windows 10, version 2004 on devices with Hypervisor-protected code integrity (HVCI) enabled

    Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.

    Bests, 


    " Please note that new questions regarding ‘Windows 10 Installation, Setup, and Deployment’ could NOT be posted in this forum anymore. This thread could be followed up until Mar-30th. We will be moving your thread to Microsoft Q&A if the deadline is missed. Register our new platform Microsoft Q&A (Preview)! for new questions or discussion. Check more details on sticky post.

    Thursday, June 4, 2020 9:12 AM
    Moderator
  • The problem I see is that unused drivers were detected as compatibility problems,
    so I could not update them (the devices were nowhere to be found in device manager, even when selecting "Show hidden devices"). 

    I already worked around the problem by removing the unused drivers (see my initial post)

    Thursday, June 4, 2020 10:08 AM
  • Hi EckiS, 

    Thank you for your reply. 

    As TechNet forum not provide log analysis and root cause analysis, so we recommend to create a ticket for checking why and what drivers detected as compatibility drivers.

    We could use the following link to create a ticket. 

    https://support.microsoft.com/en-us/supportforbusiness/productselection

    Bests, 



    " Please note that new questions regarding ‘Windows 10 Installation, Setup, and Deployment’ could NOT be posted in this forum anymore. This thread could be followed up until Mar-30th. We will be moving your thread to Microsoft Q&A if the deadline is missed. Register our new platform Microsoft Q&A (Preview)! for new questions or discussion. Check more details on sticky post.

    Tuesday, June 9, 2020 8:31 AM
    Moderator