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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
See the last time someone asked about this - I explained a few solutions: http://forum.espruino.com/conversations/297465/#comment13400243
there are loads of ways of securing Puck.js - but they are turned off by default to make it easy to get started with (much like almost every other device).
Probably the most secure is to turn off the UART service completely. There is then no way of reprogramming at all, except by removing the battery and re-starting it with the button held down.