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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
The selectbox was because you hadn't connected to the board first, so it couldn't check. Did you actually go to the link above and select the right binary?
The fact it can't find the bootloader sounds like you didn't reset it into bootloader mode? (with the blue LED)
I just tried here with an old board and it works fine for me.