I'm even still sitting on ofw 3.41 with hermes v4 dongle.
I may have to update soon too, I plan to buy ni no kuni and I may require new version of multiMAN (patching the boot.bin need a special fw version?) and go to 4.30 (for convenience, no need to wait for a patch and play the game from disc).
I have to say that even if I followed PS3 scene a little, I'm still afraid of doing changes and updates.
What I understood:
Dehashing is only a step to "reset" the downgrade information.
I'm on ofw 3.41 and didn't came from a downgrade so I don't need to dehash.
But installing QA flag is needed for easy downgrade once I've updated, to do that I fisrt need to install Rogero (kmeaw too?) 3.55cfw and rebug QA toggle.
Am I right?
The QA doesn't prevent any features to work? no games are checking for its presence?