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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
At the moment, firmware updates via the CLI aren't supported I'm afraid - so when in firmware update mode it won't appear as a usable device.
There are some people working on a JavaScript implementation of the firmware updater, so hopefully at some point the ability to update firmware with CLI will get added (although it will probably come to the IDE first)