After an insertion firmware v.1.13 it was established МАС FF:FF:FF:FF:FF:FF address. It is possible to establish connection With the receiver on bluetooth. As soon as you switch off it is established МАС 00:00:00:00:00:00 address and the receiver it is impossible to establish connection.
How it to correct?
You have programmed your MAC
You have programmed your MAC Address to '00:00:00:00:00:00'?
If yes, the only method to correct it is to reflash a firmware. The normal procedure restores the original mac address, so you should avoid that last step otherwise there is the risk of programming all 0 again.