I have an incomprehensible problem with the code, I try to connect to the combo via bluetooth connection, but the device is not displayed in the list of bluetooth devices, even after pressing REV + POWER the device is nowhere to be found (I checked on different smartphones) and throughout the whole time the code emits strange sounds of knocks from the speakers that are not solved in any way, I updated the firmware several times, this did not help in the end. Has anyone had the same problem, how did you solve it?