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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
Does arch linux have a plugdev group?
Maybe you could try restarting? It might be that the rules need reloading... I realise it's not in the Quick Start, but you can do
udevadm control --reload-rulesto force a reload without restarting.