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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.
@allObjects
@jm, that confirms what @Gordon diagnosed (and directed action): the button is not connected to the pin or the pin is not connected to the die inside the MC IC. For sure a defect, and with your measurements in post #16, we can confirm that there is a disconnect inside the MC IC between pin PC13 and die (bonding broken) or the GPIO pin appliance on the die is defect. The PICO though was originally programmed, but in low level mode where everything is erased and rewritten, including the bootloader. This obviously worked, because how else would 1v93 to come on it... ;-)
I can now understand that you took any info and any measure to overcome this issue.
Thank you a lot for sticking with us for such a long time for getting this to a resolution.