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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
It might just mean that you uploaded code that caused it to hang?
Can you get it working by shorting TILT_DOUT to 3.3v and restarting? That'll make it not load any saved code on boot.
If that works then try uploading and saving some really simple code (like turning an output on and off) and see if that works.