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M5P GPIO Pins not working

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Hi There

I got the CB1+M5P combo and I wanted to use the GPIO Pins to turn other stuff on (LED), or control the fan speed but
there is absolutely no signal on the exposed 40 GPIO pins.

I can hack something if I choose a pin on the board that is used for something else, like the BLTOUCH pin: PC13
but there seems no way to activate the exposed GPIO pins. Do I have to activate some switch?

I don't understand what those 40 exposed GPIO pins are for if they have no use?
How would I get this to work as expected?

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