Tying to get the Bluetooth connectivity disconnected, I did reboot multiple times till I could accomplish that. Like always just after rebooting I could connect the sound to my Bluetooth device, but immediately after shutting the device off and wanting to reconnect no sound arrived to the Bluetooth device. https://www.bluetoothspeaker.top/bluetooth-wireless-speaker-outdoor-sports-audio-stereo-tf-card-mobile-phone/