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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.
@muntzen
OK, thanks for the suggestion. I actually had to try four (!) different cables until one worked. I am now able to connect to the device via the Web IDE and can make the lights turn on with the right JS code. However, I still cannot get it into bootloader mode to flash it. No lights ever come on when I plug it in with the button held down and release. I've tried as many different "techniques" as I can think of. I can only get the lights to do anything by writing some JS in the IDE and sending the right functions.