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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
Just to add you're fine to use either of the 2 headers. Both have 3.3v and GND, and you can configure the UART on whatever pins you want.
Potentially you don't even have to unsolder the existing Module and could just try another on the other pins as well.