• Does he mean complex or risky (big chance of frying something)?

    Not really, just that it'll probably require some soldering to connect the wires if using the shim. However it can be done without too much trouble...

    In fact with one of the new builds of Espruino from Git and some minor tweaks, you can update the ESP8266 using just the Pico board - see @Ingmar_Guillaume's post a few after that too - you need to tweak the firmware updater to get it reliable.

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