Hi Mark,
Thank you for contacting us about the Bluetooth adapter. The following blog post contains instructions for downloading and adding that firmware.
http://plugable.com/2014/06/23/plugab…
For the chip in our adapter, the firmware hasn’t changed for A0 and A1, but since your system is calling for A1, you’ll need to rename the file in the last step, as it mentions in the blog post:
Note: With some kernel versions, you may have to rename the file to BCM20702A1-0a5c-21e8.hcd. Try the following if you see a message in dmesg that says: “Direct firmware load for brcm/BCM20702A1-0a5c-21e8.hcd failed with error -2”:
sudo cp /lib/firmware/brcm/BCM20702A0-0a5c-21e8.hcd /lib/firmware/brcm/BCM20702A1-0a5c-21e8.hcd