Well 0.98.1 did not do it for my dead die even with increasing the temperature to 65deg. Looks like RMA is the only way to get 500+ hashing. Will post how it goes.
I have the same issue; the new fw didn't fix the problem.
Try getting the temp to 83-85c(max) and let it stay for a minute or two. Make sure you are constantly monitoring the temp.
Make sure to use the BertMod 0.3 so that you can tell when the VRMs kick back in. You'll see the output go from 0A -0.37A to 46A+
As soon as all the VRMs are on, let it cool back down SLOWLY (you gotta play around with the airflow.)
Let the temp sit above 70c. Do it ONLY for the bad board. If the temp drops below 70c (at least for me, for other it has been as low as 65c), the VRM will shut off again.
I have two bad VRMs on one of my boards. I have the front fan, the heatsink fan, and a rear exhaust fan for my good unit. For the bad one, I only have the front fan on (heatsink fan off, rear exhaust fan off), and I have a small piece of folded paper in the way to stop some of the airflow hitting the VRM.

EDIT:
Seems I came to be the first on the 1000th page, so I'll just post this here
