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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.
@allObjects
@bigplik, you are talking Espriuno MDBT42Q breakout board?
...that's why I usually by 2 or more things at once if they do not cost a fortune... Looking and checking twice and still connecting the wrong way or a powered wire (pulls and) brushes over the setup is something possible to happen. Sorry for that it happened to you (too).
I'm not sure you really want to pin the failing of transition from Arduino to Espruino ecosystem... At worst I would consider it a delay...