How To Downgrade PS3 4 81 To 3 55 and Install 4 80 CFW Step by Step - YouTube
Downgradable PS3 Models - Wololo.net
PS3 - PS3 CECH-2504B Flashing 4.82 to 3.55 | PSX-Place
PS3 Tutorial (2021) - Downgrade from ANY cfw to ANY lower cfw EASY! 2 methods.. with details & tips - YouTube
Ps3 Jailbreak service - Chris Moore - Simbi
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
How to install Custom Firmware on the PS3 with FW 4.82 - Hackinformer