First off their website doesnt say that. I think it says that downgrading/upgrading your console can brick your console. That is true if you dont follow the guides to a T. You do though want to upgrade your firmware. 3.4 is not a very hack friendly version. First off its not very compitable with homebrew. Preloader as far as I know wont work with it. I dont see very many hackers using that version. I see people using 3.2, 4.1 and 4.2.