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How To] Downgrade Slim PS3 from 4.76 to 3.55 Firmware Using E3 Flasher Tutorial (Part 3 of 4) - YouTube
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PS3 4.82 OFW Downgrade Method : r/ps3jailbreak
GUIDE: PS3 4.82 CFW Installation for Dummies | Page 6 | GBAtemp.net - The Independent Video Game Community
I purchased a PS3 backward compatible from ebay for a good price and I'm impressed how clean it is. However... It's still on firmware 2.50. Should I update the firmware? : r/PS3
Jailbreak PS3 3.56 Firmware Found By Custom Firmware Genius [Download]