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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
I'm not sure what to suggest - using DfuSe should work fine to update everything - you should have total control over what's on the chip... so I'd think the lack of LED is probably some issue in your code (no idea what though!).
Chances are you found it but: http://www.espruino.com/Pico#advanced-reflashing
If you install an actual release binary like
https://www.espruino.com/binaries/espruino_1v99_pico_1r3_wiznet.binthen it should spring back to life as an Espruino. Travis builds may not work as I don't think the bootloader gets added to the firmware in those.