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.
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
