Tying to get the Bluetooth connectivity disconnected, I did reboot multiple times right until I could accomplish that. Like always right after rebooting I could connect the sound to my Bluetooth device, but soon after shutting the device off and trying to reconnect no sound came to the Bluetooth https://www.bluetoothspeaker.top/hot-sell-my-speaker-outdoor-bluetooth-speaker-with-usb-input-tf-card-function/