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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
It does seem odd - so
-B2in the junction box is definitely GND, and is also-B1?There's a chance that changing the code caused a problem but if so it wouldn't be a hardware issue. I've shipped over 10,000 devices with nRF52 and this kind of bootloader and this would be the first issue I've had though...
I'll send you an email about returns and I'll have a go with it. I'm not sure there's much you could do at this point (apart from wiring up an SWD adaptor) - but if it's not obviously fried from 12v it's something I'd repair for free.