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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.
@Vasily
i m o windows and use winflash and esptool.
after restart, try to check baudrate. must be 152000 otherwise esp not working.
and.... if you was flashing... u had to keep button pressed on sonoff entire upload process.