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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.
@user65682
I managed to update the working puck's firmware using that method. I couldn't see the troublesome puck using this method - I tried both nRF Connect and nRF Toolbox.
Can I use the serial console to check the status of the Bluetooth?