I have a problem with change МАС address of Holux 241

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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?

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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.