I installed the 0.4RC Hashfast sent me, but everything is like before:
- still only 3 dies working.
- CGMiner no longer working (Windows)
I'm a sad panda

what clock rate are you running storm2k5 ?
Tried them all, Megahurtz by Megahurtz

Currently maxing it out at 687 cause I get the best perf with it and I gave up on Hashfast (multiple tickets open for replacement, no communication, thread on their forums, no communication) I just stopped giving a damn and hope karma will strike back on them some day.
I solved the cgminer problem btw: Newer versions of cgminer on windows wont detect hashfast devices on USB3 ports.
have you try to run your miner on ubuntu 13.10 , with cgminer 4.2.0 , and the last firmware? ( try to go back to 550 gh/s , and then if all seem ok , overclock again at 575 mhz.
Yes I tried. Die 4 just doesn't do anything it seems. Why do you ask, do you know somebody with a non working die where this helped?
if you see sometime: 3 non working dies ( with a config a) , and then only one non working die with another config , that's not necessary mean you have a broken chip.... and if i ask , it's only to help you ....
cheers.

. i already had some sick output on some of my miners, and squelching errors, but all is solved now.
i hope you can find a solution to your problem.