Well, I was brave/stupid and tried igorsk's
Universal Flasher on my new 650, just to see if I could capture an image of the firmware. However, when I stick the SD card in the slot nothing much happens - the little disk light goes on briefly and that's it. The flasher software does not load.
So now I know. No harm done. But I know zilch about unix (which didn't stop me from trying
) so that is about as far as I can go.