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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
Just to add - what OS do you use? If there were a tool that would automatically flash a firmware over Bluetooth LE to any device that was in bootloader mode, that might do what you want?
Then you'd just have to run the tool, put each Puck.js into bootloader mode and wait until all the LEDs on them went out after maybe 10 minutes.