PS3 System Software 4.89 Update Live, Don't Update Your Firmware! | PSXHAX - PSXHACKS
PS3™ | System Update
Sony Pulls Down 2.40 PS3 Firmware | WIRED
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
Sony PlayStation 3 Firmware 4.88 Download | TechSpot