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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
Hi - to totally update the Espruino interpreter firmware via cable, you'll need to connect to the SWIO and SWCK pads as @allObjects says. You have to do that with a special SWD programmer (like the nRF52832DK) though - it can't be done with a normal USB TTL adaptor.
Having said that, if you just want to update your JS software and not the interpreter, you can easily do that with a wired connection using http://www.espruino.com/Puck.js#serial-console
If you're after Puck.js devices pre-flashed with a certain firmware then I can do that for you though - or potentially I could provide you with a flashing jig for Puck.js devices if you want one, but you'll still have to buy the nRF52832DK.