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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.
@fanoush
yes, that link is Q3
as for builds - you need to use SWD to unlock/mass erase it and then load full hex file including softdevice and bootloader over SWD. So getting it built might be easier step than updating it :-)