After update bluetooth earpiece volume very low. Unable to listen to music or watch movies. Please fix it ASAP. Make it working.
Try resetting mobile, wifi and bluetooth in system settings -> system -> reset options
It could also be that your BT device ha a separate volume. Fix this by increasing the volume via the bt device
Good point :)
I use such a device myself, Plantronics Explorer 10 or Plantronics Explorer 50.
update 137 is great, it fixes everything