Sony PlayStation 3 Firmware update 4.10 Downgrade on Vimeo
Downgrading with PSgrade Dongle - PS3 Developer wiki
How to Go Back to OFW 3.55 in the PS3 Recovery Mode - Our Pastimes
How to flash ps3 slim, is it possible to flash playstation 3 at home and why do it
How To Downgrade the Fat PS3 from 4.66 to 3.55 Firmware Using E3 Flasher Tutorial | Welcome to the Underground.
Tutorial - Hardware Needed for PS3 Downgrade | Se7enSins Gaming 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