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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.
@Gordon
Ok, quick update - I now have a proof of concept webpage you can go to which will update the ESP8266 firmware on an Espruino WiFi via Web Serial.
I'll tidy it up tomorrow, get it online, and that should fix your issues - I'll also change the firmware update page to link to that code