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  • Argh, sorry you've had problems. Maybe you could try powering it via 3.3v and see if it still works?
    While the board itself doesn't have reverse polarity protection, I believe it's the voltage regulator that most likely gets blown up, not the chip.

    Usually it's pretty robust. I just connected one backwards to a LiPo here to see what would happen and the voltage regulator started smoking, but the board still worked when I turned the voltage back around.

    I remember I made wrong connection with pico, but there is rectifying diode

    There's a rectifying diode on USB since you have the voltage, but on the battery pin it has to use a FET (because you can't afford to have the voltage drop). There wasn't enough board space on the MDBT42 to fit that in unfortunately.


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