PS3 System Software Update (v3.70) – PlayStation.Blog
PlayStation 3 system software - Wikipedia
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 1.80 firmware is out and streaming your media | Engadget
PS3 firmware 3.15 update to include PSP Mini support | VG247
PS3 System Software 4.86 Update Live, Don't Update Your Firmware! | PSXHAX - PSXHACKS
PS3 2.50, PSP 5.0 firmware now available in North America [update] | Engadget
PS3 firmware update to bring DivX, Blu-ray 1.1 upgrade – Destructoid
PS3 Firmware 3.0 Q&A answers some questions you may have | VG247