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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
As @fanoush says - it may not even work unless you update the bootloader (which that app can do, but I haven't supplied hex files for it).
Eventually the idea is for it to be able to load the ZIP file, decompress it and work directly off the files inside, but for now if you want to use it you need to build firmwares yourself (and then you'll get an app_hex file)