Clear COM ports

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This page is meant as a quick reference for resetting or reassigning COM ports.


  1. Run CMD as Administrator.
  2. Enter set devmgr_show_nonpresent_devices=1
  3. Enter start devmgmt.msc
  4. Select “Show hidden devices” in the ‘view’ menu.
  5. Uninstall the devices currently assigned to the unused COM ports.
  6. To assign new COM port: Right click on device -> Properties -> Port Settings -> Advanced -> COM Port Number