Micro 4/3 - E-M5 bricked!

I was using OM Workspace to update my E-M5 this evening. FW was 1.1, with eventual target of 2.3. All prompts were followed, battery was full, card was out. When I got to the spot where I was to hit "Next" and wait for the "OK" prompt, the screen went black as soon as I pressed "Next" on the...