PS3 System Update 4.81 Is Available Now To Download
How to Install Custom Firmware on PS3 4.84 - 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
PS3: CFW Evilnat 4.89 Cobra 8.3 (CEX) released - Wololo.net
PS3 IDPS Dumper for Firmware 4.81 incoming... - Hackinformer