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  • You need to have physical access to the Puck to put it in to bootloader mode - to do the steps shown here: http://www.espruino.com/Puck.js#firmware­-updates

    It's a security thing - by default I leave the Pucks open to make it easy for developers to get started, but allowing anybody to remotely change the interpreter software would be a recipe for disaster.

    The bootloader is protected by a key, but because Espruino is Open Source and people want to be able to use their own firmware the key is public - so anybody can write whatever they want onto their Pucks.

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