PS3 Update to System Software 4.89: Here's a Full Guide for You
How to bypass update 4.86 on ps3 fat? Has firmware: Cobra 8.01, and mmCM Version 4.85.01 : r/ps3hacks
PS3 Firmware Update 4.70 Available for Download, Brings Fresh PSN Logo - Update
If I have a Dex jailbroken PS3 on 4.84, can I still get online even though the latest version is 4. 84? If not, how do I update it without ruining the jailbreak? - Quora