PlayStation 3 System Software Update 4.89 : Brandon Michael Hafer, Sony Interactive Entertainment : Free Download, Borrow, and Streaming : Internet Archive
Sony PlayStation 3 PS3 160GB System Fat Console CECHP01 BluRay 4.81 De
PS3 Update to System Software 4.89: Here's a Full Guide for You - MiniTool Partition Wizard
PS3 Firmware Update 4.81 Improves “Quality” of System Performance
Recovery Menu - PS3 Developer wiki
PS3 update 4.82 out & should you update? NO! - Hackinformer
update 4.89 just dropped. : r/PS3
PS3 - [TuT] How to sign in on OFW 4.81 or 4.82 & activate your system | PSX-Place
Sony PlayStation 3 Firmware 4.90 Download | TechSpot