PS3 System Software Update 4.87 Now Available For Download - PlayStation Universe
PS3 Update to System Software 4.89: Here's a Full Guide for You
Surprise! There's a new PS3 firmware update - here's what patch 4.88 does | TheSixthAxis
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