Just an update:
I had this same issue. Then I studied the LUA upload tool (NodeMCU-PyFlasher-1.0.1), Then I tried all diff perms and combs until I got a working LUA firmware flashed sucessfully. Then I mimicked those params to esptool.py .... This is same as @Phando (but running with esptool.py 1.3).
esptool.py --port /dev/ttyUSB0 --baud 115200 write_flash \
--flash_freq 80m --flash_mode dio --flash_size 32m \
0x0000 "boot_v1.6.bin" 0x1000 espruino_esp8266_user1.bin \
0x3FC000 esp_init_data_default.bin 0x3FE000 blank.bin
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