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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
Really Green? Or do you mean blue?
Is it an Android Phone, or iPhone? The iPhone version of nRF connect doesn't have the DFU icon and you need nRF Toolbox (there are instructions at the link above for iPhones)