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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.
@graf
Success! After countless tries, fiddling with cables, changing ports, pushing espruino buttons in frustration etc finally it went through with no errors. After that every consecutive try so far works fine.
I don't have a clue what was the problem as I'm still using the same cable and USB port. But I guess if you get the same problem then just keep trying, it will come back to life :)