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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.
@tve
Assuming that the esp8266 and the bootloader support that size flash, then:
that should be 0xFFC000 esp_init_data_default.bin 0xFFE000 blank.bin
There is no harm in you programming it for a smaller size to test and work your way up.