GitHub - ScriptedArtsOfficial/PS3-CFW-XENON: This is a Custom Firmware for the Playstation 3 that I am working on currently whenever I have spare time,
GitHub - ZHassanQ/PS3-CFW-Guide: This is a repository contains a guide to how to install CFW (Custom Firmware) on your PlayStation 3.
Downgrade any CFW PS3 to 3.55 or any other CFW - DIYProjects.Tech
Habib 4.78 Cobra 7.3 CFW released for PS3. Improves PS2 Games loading + bunch of other improvements - Wololo.net
Jailbreak Your PS3 and install CFW 4.87 FERROX COBRA 8.20 : r/ps3homebrew