power supply at J12

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is it possible to connect power supply at J12 (Pin1/8) without damage the board?

I have read that it is not possible over GPIO-pins but I have not read anything analogue for J12.

I believe it is not possible as well...

No way...

the J12 Vcc pin does not connect directly to the micro-usb dc-in.

it comes from a dc-dc converter which will be damaged by an external supply.

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