• I am having a hard time getting this thing into DFU mode. Meanwhile I have connected / disconnected power and D0 many times I don't even know in what state it is now. The device is showing up in nRF Scanner as MDBT42Q.

    Just to make sure: do I have to connect all GND to minus of the battery or just one?

    This is how I have it now: GND is connected to the upper left pin. D0 is connected to VDD.
    I then connect power to VDD and right after that disconnect D0.
    That's correct, isn't it?


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