Resetting GEN 3 device back to factory defaults

Is this possible?

I think through my tinkering I have screwed up the Gen 3 DIY device. Despite re-flashing, the device refuses to do anything other than flash the green LED at me.

  • It briefly raises the Initial WiFi, but not for long enough to log in and see what’s going on.
  • Equally, there is no evidence of 3G activity (at least no evidence of anything at cloud).
  • Despite installing the jumper, it reboots every 3-5 minutes.

If reflashing fails to recover the device, what else can I do. Or is the device bricked?