PlayStation 3 System Software Update 4.89 : Brandon Michael Hafer, Sony Interactive Entertainment : Free Download, Borrow, and Streaming : Internet Archive
PS3 Update to System Software 4.89: Here's a Full Guide for You - MiniTool Partition Wizard
PS3 System Update 4.89, PS Vita System Update 3.74 Disable PSN Account Creation - PlayStation Universe
How To Jailbreak Your PlayStation 3 (PS3) On Firmware 4.89! - YouTube