How to Jailbreak Your PS3 on Firmware 4.84 or Lower! - YouTube
PS3 CFW Rogero 4.55 V1.00 - Consoleinfo
PlayStation 3 Firmware Update 4.40 – Download Here
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Jailbreak PS3 3.56 Firmware Found By Custom Firmware Genius [Download]
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 Update 4.80 Now Available To Download | Attack of the Fanboy