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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
Do you have another computer that you could try updating the Pico's firmware to 1v80 on? There were a few changes in that which could have made it behave a bit better on Macs.
If you don't have another computer handy then you could follow the instructions for DFU update under the Advanced Reflashing heading on this page. It's just a bit more involved.