Bluetooth headset with pool sound quality

refer: https://askubuntu.com/questions/676853/bluetooth-headset-with-poor-sound-quality-on-ubuntu

Edit /etc/bluetooth/main.conf

First add the following lines under the [General] tag (copied from audio.conf, I found searching for a solution):

# Automatically connect both A2DP and HFP/HSP profiles for incoming
# connections. Some headsets that support both profiles will only connect the
# other one automatically so the default setting of true is usually a good
# idea.
AutoConnect=true

Next you must enable support for multiple profiles (a few lines below) just uncomment and set value to multiple

MultiProfile = multiple

Then restart bluetooth service

sudo systemctl restart bluetooth