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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.
@JamesS
@jschappet it looks like you are attempting to update the firmware for eeb8 using the CLI? I am not sure if this is supported yet for puck.js. The method that does work as @Ollie says is to download the latest firmware to your phone and then (while the puck is in update mode) use nRF Toolbox app in DFU mode as described elsewhere in this forum.