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Yes, you can still downgrade with a broken bluray or without one. follow the attached link: PS3 Downloads - PS3 Downgrade Tools
Originally Posted by impatientfrog
look for the Lv2diag.self file for broken/ missing drives. I've personally used this to upgrade to 3.41, to OFW 3.55 and finally to Kmeaw CFW 3.55. Now if someone can allow for homebrews to run without need for BR logic boards, detection, etc. But hey, I'm one step closer!