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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.
@countxerox
Hi .Neil,
On my ESP8266 board (ESP-12F), the blue LED does 2 or 3 very quick flashes then a very short pause then one more quick flash. Then it's in bootloader mode. Also I found I needed to powercycle it first, erase it with...
then powercycle again before flashing and powercycle again before using it.
I know you're using a different board but hope that helps.