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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
Sorry you're having trouble with it. For these initial Espruino WiFi boards I have personally flashed and tested every single board before packing them up, so I can guarantee they're working.
And you've been using an Espruino Pico without issues, on the same computer?
If you run
dmesgbefore and after plugging the board in, is anything displayed?The Red + Green on together mean it's working, in bootloader mode, but can't connect to USB. That's classic USB cable problem - I have a whole bunch here that came with cheap chargers that don't have the data pins connected at all - they're power only.
Are you sure they work for USB data on other things, and don't just charge them? Perhaps try them in another USB port on your computer?