Hello I have a problem I am using Linux redhat version in my laptop and I tried to install BlueZ implementation because I want to use Bluetooth card 3Com in my computer but it is not possible to do it without saving BlueZ implementation but the thing is after Bluez implementation from the Bluez.org web site then I insert the 3com card to the laptop and then I restart my computer but when I wrote the comment in the Linux then it gave an error ' no such device' instead of reading the 3Com Bluetooth card and then I realized the error ' bluetooth linux serial_cs: register_serial() at 0x02f8, irq 3 failed' and I don't know about this error.