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How To] Downgrade Slim PS3 from 4.76 to 3.55 Firmware Using E3 Flasher Tutorial (Part 4 of 4) - YouTube
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PlayStation 3 hacked with CFW again. "release of LV0 decryption keys will allow jailbroken consoles to circumvent any future security updates made by Sony." : r/gamernews
How to downgrade my PS3 OFW from 4.81 to 3.54 - Quora
How To Downgrade Your 4.90 CFW PS3 *Easy* - YouTube