How to Jailbreak Your PS3 on Firmware 4.89 or Lower! - YouTube
PS3 System Update 4.81 Is Available Now To Download
PlayStation 3: Sony releases Firmware 4.86 for their 13 year old console - HFW 4.86 released, SEN Enabler updated & PS3HEN to be updated soon due to no kernel changes! - Wololo.net
How to Jailbreak a PS3 (with Pictures) - wikiHow
Webman Mod and Launchpad on PS3 Rebug 4.81.2 - YouTube