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when I connect D0 it gets offline and returns as soon as I disconnect D0
What do you mean by that? When it is already running as MDBT42Q connecting D0 breaks the connection and device is not visible? That looks like shorting VDD and GND by mistake, otherwise there is no reason.
And BTW when device switches to DFU and advertises as DFUTarg the MAC address last number is changed by one so you won't see same device with same MAC => you can't connect to it by using same MAC as when it is named MDBT42Q. But I guess that is not an issue here.
fanoush
I have tried again and again ... doesn't seem to work. I see the module in the scanner app showing up as MDBT42Q, when I connect D0 it gets offline and returns as soon as I disconnect D0. So I believe the connecting works, powering as well, otherwise it wouldn't show up at all. Very annoying.
I'll try to attach an LED.