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Woot!.. that is good news.
It was documented on the ESPTool page
Most boards use qio mode. Some ESP8266 modules, including the ESP-12E
modules on some (not all) NodeMCU boards, are dual I/O and the
firmware will only boot when flashed with --flash_mode dio. Most ESP32
modules are also dual I/O.
swaroop
stevo
Ah ha the answer for me was changing from 'qio' to 'dio'.
No more errors woot!