For more than half a year experiencing constant issues with BT headphones connectivity. Music drops as far as i start activity (run) and move my arm. I'm not the only one according to this forum. Seems to me that Garmin dont have any kind of F/W archive.
Maybe someone keeps previous versions of Forerunner 245 Music firmwares and can share a link?
Dont know exactly from what f/w update ANT/BLE jumped to 6.15. Maybe 1-1.5 year old firmware will be just right