Just purchased the Killzone 3 Bundle for PS3 and came with 3.50 Firmware. I want to upgrade to 3.55, but not doing it through the PS3 wants me to upgrade to 3.60. I need a site where I can download 3.55 version. I have googled and most sites have been Custom Firmware. Thanks for any help. I am new to all this so I hope I put this is right area.