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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.
@Artiom
By the way: Info on DFU tool says that the content of the zip have to be following:
softdevice.hex bootloader.hex application.hex
And this is not what I see in the zip 1v90: I see .bin .dat and .json