In Windows 11, the Virtual USB MultiKey Code 39 typically signals that the operating system has blocked the driver from loading
If your device presents itself as a serial device, explore tools like com0com . Virtual Usb Multikey Code 39 Windows 11
If the error is caused by "UpperFilters" or "LowerFilters" in the registry: Press Win + R , type regedit , and hit Enter. In Windows 11, the Virtual USB MultiKey Code
In the Registry Editor, go to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 (This is the class ID for USB controllers). In Windows 11
Invalid entries in the "UpperFilters" or "LowerFilters" registry keys can prevent the driver stack from loading.
This is critical.