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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
Great! Glad you got it sorted!
There are several other ways to update firmware too - in many cases using a phone is the most reliable. It should all be documented and kept up to date at http://www.espruino.com/Firmware+Update#nrf52