662. Mini-post: Getting a bluetooth headset to work on linux -- B350-XT

 I have a BlueParrot  B350-XT which is causing issues on linux. It pairs fine, and shows up as a sound device, but it won't actually play sound or record sound.

Looking at dmesg -T, I see

[Tue Aug 18 01:25:33 2020] Bluetooth: hci0: BCM: chip id 63
[Tue Aug 18 01:25:33 2020] Bluetooth: hci0: BCM: features 0x07
[Tue Aug 18 01:25:33 2020] Bluetooth: hci0: BCM20702A
[Tue Aug 18 01:25:33 2020] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
[Tue Aug 18 01:25:33 2020] bluetooth hci0: firmware: failed to load brcm/BCM20702A1-050d-065a.hcd (-2)
[Tue Aug 18 01:25:33 2020] bluetooth hci0: Direct firmware load for brcm/BCM20702A1-050d-065a.hcd failed with error -2
[Tue Aug 18 01:25:33 2020] Bluetooth: hci0: BCM: Patch brcm/BCM20702A1-050d-065a.hcd not found

To solve this, unplug/turn off your headset. REMOVE/FORGET the device  so that you can re-pair it.

Next, go to https://github.com/winterheart/broadcom-bt-firmware/blob/master/brcm/BCM20702A1-050d-065a.hcd

Download the hcd file to ~/Downloads, then

me@niobium:/lib$ sudo mkdir /lib/firmware/brcm

me@niobium:/lib$ sudo cp ~/Downloads/BCM20702A1-050d-065a.hcd /lib/firmware/brcm/

Now try again. 

Output from dmesg -T:

[Tue Aug 18 01:33:59 2020] Bluetooth: hci0: BCM: chip id 63

[Tue Aug 18 01:33:59 2020] Bluetooth: hci0: BCM: features 0x07

[Tue Aug 18 01:33:59 2020] Bluetooth: hci0: BCM20702A

[Tue Aug 18 01:33:59 2020] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000

[Tue Aug 18 01:33:59 2020] bluetooth hci0: firmware: direct-loading firmware brcm/BCM20702A1-050d-065a.hcd

[Tue Aug 18 01:33:59 2020] Bluetooth: hci0: BCM20702A1 (001.002.014) build 1482

[Tue Aug 18 01:33:59 2020] Bluetooth: hci0: Broadcom Bluetooth Device