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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.
@user125833
I pulled out my oscilloscope and debugged the hardware. It turned out that the manufacturer had mounted one component the wrong way around, which caused a current leak. Amazingly nothing was shorted.
However, I still need to define other pins than D6 and D7 for Serial1 and recompile, which is fine for now.
Thanks for the help! I definitely learned a lot in the process :)