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The warning on the last line is the red herring. My nodemcu uses the ESP-12 model and I should be loading the firmware with this string:
esptool.py --port COM3 --baud 460800 write_flash --flash_freq 80m --flash_mode qio --flash_size 32m 0x0000 "boot_v1.4(b1).bin" 0x1000 espruino_esp8266_user1.bin 0x37E000 blank.bin

Thanks SpenceKonde for your confirmation on IRC

Hi all, I'm running a v1.0 of Nodemcu loaded with espruino_1v84.tve_master_d8dec28_esp8266­ of the firmware.

First off: I must say that JS on the ESP8266 is SO much more stable than the stock LUA! The library support in comparison is amazing too.

Now to the problem: I've got my codes working. save() wrote my code and soft-booted. Everything is perfect. But when I do a hard reset (via esp8266.restart()) nothing starts up. I suspect this has something to do with it (screen upon startup):

 ets Jan  8 2013,rst cause:2, boot mode:(3,0)
load 0x40100000, len 1396, room 16
tail 4
chksum 0x89
load 0x3ffe8000, len 776, room 4
tail 4
chksum 0xe8
load 0x3ffe8308, len 540, room 4
tail 8
chksum 0xc0
csum 0xc0
2nd boot version : 1.4(b1)
  SPI Speed      : 40MHz
  SPI Mode       : QIO
  SPI Flash Size & Map: 4Mbit(256KB+256KB)
jump to run user1 @ 1000
don't use rtc mem data
rl
 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v84.tve_master_d8dec28 Copyright 2015 G.Williams
WARNING: the esp8266 port is in beta!
Flash map 512KB:256/256, manuf 0xe0 chip 0x4016
WARNING: *** Your flash chip does not match your flash map ***

Can someone advise how I should correct my firmware install?