How to downgrade ps3 firmware and jailbreak the console
PS3 Tutorial/Guide/Downgrade Files with E3 flasher | ConsoleCrunch Official Site
How to Downgrade a PS3 to 3.55 with E3 Flasher (EASY!) - YouTube
How to Downgrade CFW on a Jailbroken PS3 - YouTube
10 PCS a lot High quality downgrade Took Kit for PS3 for E3 Flasher E3 Nor Flash Clip Suit Cable for Playstation 3|Replacement Parts & Accessories| - AliExpress