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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Jean-Philippe_Rey
Anyway, that point is not of great importance, I understand your point of view. I don't think that removing the diode is relevant. For some reason, at Particle.io, they chose to put a reverse voltage protection diode on the Core, even if they put a micro-usb connector on it, just as this board you are designing.