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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
Do you have a video? If it's doing that I'd imagine it is totally unrelated to the SWD pins. It could be that the external flash memory has got corrupted.
Which firmware version are you on? I know there were issues in 2v15 but I'm pretty sure they got fixed on 2v16