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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.
Alexander
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?