If any of you are like me (On firmware 3.50, 3.55, etc. Do not tell me what you are on because I could care less) then avoiding PSN can sometimes be tricky. I have made 2 guides one is simple (Unsure) and the other is a bit harder, but ensures you won't be updated.
Guide 1:
Guide 2:
Guide To Blocking PSN Updates (And PSN in general)
Guide 1:
SIMPLE
BEST METHOD
Guide To Blocking PSN Updates (And PSN in general)