pnputil /delete-driver oemXX.inf /uninstall /force pnputil /add-driver "C:\Mastercam\Drivers\mastercam_usb.inf" /install
Ensuring you have the latest driver can sometimes bypass the need to lower security settings. Matsusada Precision Download the latest Sentinel HASP LDK Runtime from the official Thales (formerly SafeNet/Gemalto) support page Uninstall existing drivers via Device Manager
It is the virtualized USB port that tricks Mastercam into believing a hardware SIM (HASP) is plugged in.
The "Virtual USB Bus Error 39" fix is not a piece of software you review for features or aesthetics; it is a utilityReviewed as a survival tool for running legacy versions of Mastercam (specifically X7 through X9) on modern Windows 10 and 11 operating systems. While it solves a critical problem, it requires careful handling regarding system security. mastercam x72022 virtual usb bus error 39 updated
In some versions of the driver (often labeled "MUSB" or "MultKey"), users report that while the installer runs, the device never fully activates, leaving a permanent yellow "!" in Device Manager.
A Windows update replaced or blacklisted the driver. Reinstalling the crack fails because Windows now blocks loading it (error 39 in Device Manager → Virtual USB Bus).
Sometimes faulty registry entries prevent the driver from loading. Press Win + R , type , and hit Enter. pnputil /delete-driver oemXX
The most common trigger for Error 39 on modern operating systems is the Windows Hypervisor-protected Code Integrity (HVCI).
In this updated guide for 2025, we will explain exactly what causes the "Virtual USB Bus Error 39" in Mastercam X7 and 2022, and provide a step-by-step walkthrough to permanently resolve it.
Crashing or running multiple parallel instances of Mastercam can permanently break the user profile's driver associations. While it solves a critical problem, it requires
: Find and delete the UpperFilters and LowerFilters values in the right pane, then restart your computer. Alternative Solutions
This resolves the "virtual bus resource conflict" that causes Error 39 in Mastercam 2022 specifically.