i never done it but i think you'll need a pen drive that you download the option file from the net onto, then pop it into your ps3, my mate done it but it wasnt as simple and plug and play, he had to fanny about with things..im sure theres instructions to how its done on this forum somewhere, ill have a look
pm the admin pategato, hes the main man around these parts. it was 2008 the time my friend done it. There might be an easier way now. If pategato don't know, then theres no way you can use an option file without the use of a pc