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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.
JeonLab
There's no schematic, no. I believe the PCB is 4 layers so it's not easy to trace out!
Basically everything I know is in https://www.espruino.com/Bangle.js2+Technical
But if you find a testpoint, all the pins we know are marked in that doc so you can just try toggling/reading the other pins and see if anything happens?