c0dist,
For clarification?
First post states flash completes
Last post states flash fails midway.
I assume you mean F5 from the UD5 page flashes, but shows F4 after restart, and the beta for the "Thunderbolt" never makes it off the ground?
I agree you don't really have anywhere to go from here without help from support if you've tried the above suggestions without luck. I'd try to get a case open in the interim.