P1 listening mode can't connect, then SOS hard fault after SWD flash

[rickkas7]

This doesn't solve your current problem, but the second to last section of this tutorial explains how to get your device ID by SWD:

Finding your device ID

Updated 2016-10-19: Added Android OTG instructions The device ID uniquely identifies your Particle device (Photon, Electron, P1, Core, etc.) to the Particle cloud. It consists of 24 hexadecimal characters, and looks like this: 1e0032123447343149111039 That’s a made-up device ID. And you should probably avoid sharing your actual device IDs in public, just to be safe. Using the Particle CLI For the Photon, Electron, and Core, an easy way is to use the [Particle CLI] (https://particle.io/cli). …

I've been meaning to figure out and write up a guide for programming firmware by SWD. I'm not sure I'll get to that soon enough for your purposes, however.