i do not follower each and individual ocz vertex firmware, but i do remember on the prelude to the v3 release i was spending a lot of time over at the ocz forums and seems that each f/w update provided a new fix and resolved a certain issue, sleep for e.g.
My best guess would be for a definitive answer ask the mods over on ocz forums/sandforce support - the forums are great and you will get the answer from official staff!