Com port hell

Just a quick sef-reminder: Some Bluetooth applications on windows will only connect to a device through a virtual com port smaller than com9 or something. On the other hand, most bluetooth stacks seem to have to annoying habit to block a lot of com ports permanently if the adpater is plugged into different USB sockets.

Unfortunately, those COM ports never show up in Window’s hardware manager, even if you enable the “Show hidden devices” option; so there’s no way to unistall them.

At least there’s a workaround, hidden deep inside the Microsoft knowledge base:;en-us;315539

At a command prompt, type the following command , and then press ENTER:

set devmgr_show_nonpresent_devices=1

Type the following command a command prompt, and then press ENTER:

start devmgmt.msc

Remember that you still have to enable the “Show hidden devices” option in the hardware manager to see the “ghost” devices.


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