Clicking the banner up top labelled PS3 SCENE STATUS will take you here:
You have a PHAT PS3 so it can downgrade to 3.55. Now you have to decide if you wanna downgrade your self with Progskeet or Teensy++......or pay someone to do it for you.
BTW...Welcome to the forums. Be sure to read up as much as possible. I'm sure all of your questions have been answered before in this forum.