If Windows continues to block the virtual driver, you may need to disable signature checks temporarily. Run the tool. Enable Test Mode and select Sign a System File .
Download the latest from the Thales Sentinel Support Page. mastercam x72022 virtual usb bus error link
Invalid "UpperFilters" or "LowerFilters" values in the Windows Registry can cause Code 39 errors. Step-by-Step Fixes for Virtual USB Bus Errors 1. Disable Core Isolation (Recommended for Windows 10/11) If Windows continues to block the virtual driver,
Before attempting third-party "patches," ensure the official Sentinel HASP drivers are up to date. Download the latest from the Thales Sentinel Support Page
Use the Mastercam System Inspector to generate a report and verify if your physical or virtual dongle is being recognized correctly. 4. Bypass Driver Signature Enforcement
Features like Memory Integrity can prevent the virtual USB bus from loading.
Enter the path to the virtual USB driver (typically found in your Mastercam installation directory). Restart your machine to apply the changes. Summary Troubleshooting Table Target Issue Primary Action Windows 10/11 Security Turn off Memory Integrity in Windows Security Registry Edit Driver Corruption (Code 39) Delete "UpperFilters" in regedit Driver Signature Unverified Driver Blocks Use DSEO to sign virtual driver files Clean Install General License Errors Uninstall old MultiKey and run latest install as Admin
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