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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
Looks like your board isn't in bootloader mode? Hold down BTN1 and then press and release RST - the blue LED should start glowing and then you can flash it.
BUT you actually need to write to a different address (0x08002800 - because of the bootloader).
It's best just to run:
And that will automatically call the correct command.