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.
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.
Woot!.. that is good news.
It was documented on the ESPTool page