I probably I have a usb-serial adapter that is your thing, why? unlike regular adapters that simulate a com, this ? just a rs232 port real. once installed on the PC works as a com port on the original motherboard.
I use it to update some of the diagnostic tester with the standard adapter usb-to-serial not go why? need a real com for the update.
I don't want to go to the one who tries to make a buck, but since I paid about 150euros if you want I can sell, I don't want to lend it and send it in somewhere? which region of italy.
eventually we discuss it in PM.