The Newest PS3 Update Comes in the Form of Version 4.84
PS3 4.80 System Software Update Sony Continues to Provide Support - YouTube
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 Your PS3 on Firmware 4.82 or Lower! - YouTube