By NOTORIOUSTiTANx on Jun 22, 2016: #1 I'm new to jailbreaking etc and I don't really know much. My PS3 fat doesn't have a blue ray drive and I want to downgrade my PS3 to 3.55. Right now I'm on cfw 4.78 Ferrox. I've searched on google on how to downgrade back to 3.55 with nobd but its all confusing for me so I really need help. Thanks.