In the right pane, look for or LowerFilters and Delete them. Restart your computer. Troubleshooting Additional Causes Mastercam USB HASP issue - eMastercam.com

If the system still fails to load the driver, you may need to clear corrupted filter entries in the registry. Press Win + R , type regedit , and press Enter.

This is the most frequent fix for modern Windows 10 and 11 systems where security features prevent the Virtual USB Bus driver from loading.

: Go to Settings > Update & Security > Windows Security > Device Security .

Download and install the latest HASP drivers from official support sites like Thales Customer Support. 3. Registry Editor Fix (UpperFilters/LowerFilters)