One more option:

 

1. Open a Terminal window

 

2. Check your current setting

 

sudo defaults read /Library/Preferences/com.apple.airport.bt.plist bluetoothCoexMgmt

 

It is absolutelly normal to have it stating that the setting does not exist. It just means that to revert you have just to delete it.

 

3. Set the new value to Hybrid

 

sudo defaults write /Library/Preferences/com.apple.airport.bt.plist bluetoothCoexMgmt Hybrid

 

4. reboot

 

 

To revert to the previous setting, either delete it if it did not exist…

  sudo defaults delete /Library/Preferences/com.apple.airport.bt.plist bluetoothCoexMgmt

 

 

… or re-write it its previous value:

  sudo defaults write /Library/Preferences/com.apple.airport.bt.plist bluetoothCoexMgmt <old-value>

 

Don’t forget to reboot.