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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.
@DuncanCragg
Well I gave up on the uf2 stuff and zapped it via SWD, and now it's properly shagged I think. :-D
I zapped it with the full Espruino bootloader/SD140/app_hex package.