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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
By default, all the Pico's pins will be floating - so if you do use an FTDI cable there's no need to disconnect the ESP8266 from the Pico - just tack RX, TX and GND wires on top of the module.
It's annoying - I'm not really sure what could be causing the issue, as I've updated loads of ESP8266s this way... Unless there was some change to the uploader recently that broke things.