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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.
gendor
Sorry for the delay getting back to you - we'll actually have programmed MDBT42Q modules back in stock by the end of today.
But to flash them yourself, you'd ideally need to use SWD pins on your PCB, yes. I believe Raytac may sell an (expensive) flashing jig, or you could make your own though.