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Mastercam+x72022+virtual+usb+bus+error+39+fixed
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\36fc9e60-c465-11cf-8056-444553540000 (This is the class for USB controllers).
bcdedit /set testsigning off bcdedit /set nointegritychecks off mastercam+x72022+virtual+usb+bus+error+39+fixed
One day — often after a Windows Update, driver update, or reinstall — you see in under System devices : abandon the virtual bus entirely:
If Error 39 keeps returning, abandon the virtual bus entirely: mastercam+x72022+virtual+usb+bus+error+39+fixed