Sony PS3 Receives Firmware 4.66 – Download and Apply Now
Bypass PS3 firmware 3.21 in seconds -- at your own risk (update: defunct) | Engadget
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
PS3 System Software Update – 3.15 – PlayStation.Blog
Sony PS3 Receives Firmware 4.66 – Download and Apply Now