Due to Windows inexplicable Registry reasons, many users find that after installing the Bluetooth management software, the corresponding Bluetooth virtual port actually turns COM9, even COM13 or higher, resulting in many applications, such as mobile synchronization software, PDA synchronous software cannot be Using multiple reinstallation Bluetooth management software will only make the situation more degraded..
The solution is as follows (Before performing the following steps, please uninstall the Bluetooth manager, and reboot) 1. In the Windows system, press Start> Perform> Enter CMD, press Enter 2. After the command character window, enter set devmgr_show_nonpresent_devices = 1 Press Enter to press Enter 3. Then click in Device Manager> View> Show hidden devices You can now delete excess ports, after deleting, please be sure to turn back
4. Reinstall Bluetooth management software
5. If you want to permanently put this environment variable to XP, go to my computer> Click, press the mouse button> Properties> Advanced> Environment variables inside the system variable, press "New", fill in "Variable Name" Enter "devmgr_show_nonpresent_devices", the variable value is filled in "1"
