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Corrupted system files can also trigger Code 39 errors across various hardware devices, not just virtual USB drivers. Running system file checks often resolves these underlying issues.
For persistent Error 39 that survives all the above:
bcdedit /set testsigning off
Give you the link to the if the new ones don't work. Share public link
Navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C467-11CF-8056-444553540000
Disclaimer: Mastercam and Sentinel are trademarks of their respective owners. This guide is for troubleshooting purposes based on common user experiences. Suggest .
| Mastercam Version | Virtual USB Bus required? | Additional notes | |------------------|--------------------------|------------------| | X7 – X9 | Yes | Most susceptible to Error 39. Test signing mandatory on Windows 10+. | | 2017 – 2021 | Yes | Still uses HASP. Error 39 appears after Windows 11 upgrade. | | 2022 | No (uses CodeMeter) | If you see Error 39, you installed a HASP-based license incorrectly. Uninstall Virtual USB Bus completely. | | 2023+ | No | Not affected. |
Open regedit and delete these keys :
You’ve just installed Mastercam—the industry-standard CAM software. You’ve disabled antivirus, run the installer as administrator, and rebooted. But when you launch the application, you’re met with a cryptic warning:
In the right pane, look for and LowerFilters values.