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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
No, it's an issue with the current version of the firmware. If you power it from a USB power supply then it should work first time? It's fixed in the USB HID firmware, but there's still a bit of work to do before I do a full release of that.
The issue is that when the Pico is connected to a PC, there is a USB connection made, but the PC is not reading any information the Pico transmits - so the pico just 'stalls', waiting for the characters to be read.