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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.
@JumJum
Before flashing you have to connect gpio0 (GPIO zero) to low and do a hardware reset.
On the board you can see the blue LED flashing shorter if in Flash mode.
After flashing remove this connection before doing hardware reset.
If there is a problem during flashing, the circle on left bottom becomes red.
In this case retry and sometimes its better to flash both files seperately.