Serial ports COM3-COM49 used, but not listed in device manager

Serial ports COM3-COM49 used, but not listed in device manager Some piece of software or some driver appears to be using the serial ports COM3-COM49.
Asked by: Guest \| Views: 377

Total answers/comments: 1

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Guest [Entry]

"Go to My Computer, Properties, Advanced, Environment Variables, and make a System variable named

devmgr_show_nonpresent_devices

Make its value 1.

Now go to device manager, view, and check Show Hidden Devices.

Now expand Ports(COM & LPT). You'll see more ports than you did before. Right-click on and Uninstall whichever of the greyed-out ports you don't want."