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  • Try using the files in this directory

    \espruinoEsp8266Flash\espruino_1v95_esp8­266

    not this directory

    \espruinoEsp8266Flash\espruino_1v95_esp8­266_4mb"

    You might want to switch to ESPtool.py (Linux or windows)
    I used to use the ExpressIF tool but switched to ESPtool.py because I can use batch files to do the flashing in a few mouse clicks:

    Using Batch Files to Flash

    How to get ESPtool.py

    some info

    One gotcha is the ExpressIF tool flash size is given in bits, ESPtool.py uses bytes.

    Which ESP8266 chip are you trying to flash?

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