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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.
@Gordon
Moved to ESP8266 forums - this is 100% ESP8266 related.
The hex file does contain the data but potentially the address might be wrong because of the flash map... @MaBe?
However the easy solution is just to take an ESP8266, flash it with Espruino plus the firmware you want, run it up in bootloader, and read out the contents of flash.