Sorry if this is mentioned already, I didn't find it.
I'm about to update to 3.56. Currently I'm on 3.55 kmeaw. I have some disc-based games on the internal, some PSN games, MultiMan, etc. AFAIK I didn't use ANY sort of game backup since upgrading from 3.41 w/ dongle to 3.55 kmeaw. Only played DCUO. I did go online with the DNS trick once, maybe a day or two after 3.56 went live. Haven't been on since. I didn't receive an email threat.
Should I do a complete format 1st to be safe? And if yes, should I deactivate my system from my account before doing so, then reactivate later? Is it even possible to do the deactivation without going online?