Hello,
This "Failed DF - Reinstall with IO Before and After" test uninstalls and reinstalls the drivers for selected devices and runs IO on devices, verifies that no device or driver, except the device under test, has been affected by devices, driver installations, or co-install processes, and verifies that no system resources have been overwritten during a device or driver package installation.
You can read in detail about the test and parameters here:
As troubleshooting steps to root down the cause should be:
1.Install latest updates and filters
2.Review the Status icons
3.Make sure that the test was run correctly
4.Check for configuration changes
5.Identify the failure category
6.Contact Windows HLK Support
More detailed steps and reference links can be found at this official article:
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