Hi all, I'm not sure if this is the right place to ask.
I have a PS3 which bought 2 yrs ago and I seldom play it. Therefore I lend it to my cousin so that he can fully utilize my PS3 and recently I wan get it back for GOW ascension. However, I discovered that he installed CFW 3.55 on my PS3
Now, I can't play any game due to the CFW. I want to restore it to the original state, how do I do that? Just install the latest PS3 firmware like I used to do previously? or I need to format the entire hard disk so that I will not get ban by the PSN?
It's been quite some time since I last used my PS3, world change and things change, anyone mind to PM me the step by step guide to restore to OFW?

Sorry if I offended some of the rules but i really need help...

ic, many thanks man.. what about psn? won't get ban? because my cousin also installed those homebrew software to backup game. i afraid it ban my psn acc..