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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.
@Gordon
As @Ollie says the Espruino MDBT42Q board was designed for running Espruino, a JS interpreter. We don't support running other types of firmware on there - and honestly I think you'd find Espruino's JS easier if you plan to do any Bluetooth stuff.
I'm not 100% sure about micropython support on nRF52832 but I know that Adafruit does support it (https://circuitpython.org/board/feather_nrf52832/). While you may be able to run that firmware on the MDBT42 breakout (since it uses that module) you may find it easier just to buy their board instead as I believe it'll have it preinstalled.