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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
Hi - sorry to hear it's not working. Why did you run the code in https://www.espruino.com/Puck.js#recovery-after-2v04-installation - had you actually installed an earlier firmware version that had effectively bricked it beforehand?
It's an odd one - I had tested that code previously, but I bet on the device I used no code was saved in storage, so address 0x78000 was empty and the softdevice continued as normal.
So as @fanoush says I think you'll have to connect up SWD and rewrite the firmware.
Do you have any of these devices handy?