Invalid entries under the UpperFilters and LowerFilters keys disrupt standard or virtual USB communication hubs.
This is one of the most persistent driver errors among Mastercam users, but fortunately, it is also one of the most solvable using the troubleshooting methods outlined in this guide. mastercam x72022 virtual usb bus error 39 updated
Error 39 (Virtual USB Bus) in Mastercam X7 2022 typically indicates a problem with the software's USB licensing/emulation layer or the system drivers that support virtual USB dongles (software or hardware dongles). This updated guide explains common causes, step-by-step troubleshooting, and recommended fixes. Invalid entries under the UpperFilters and LowerFilters keys
"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)" (Code 39)" If you installed Mastercam 2022 (
If you installed Mastercam 2022 ( CodeMeter licensing) after uninstalling Mastercam X7 ( HASP licensing), remnants of both systems fight over the USB bus.
Navigate to the following path: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36FC9E60-C465-11CF-8056-444553540000