How to Jailbreak Your PS3 on Firmware 4.89 or Lower! - YouTube
PlayStation 3: Sony releases Firmware 4.87 for their 14 year old console - HFW 4.87.1 is already out with SEN Enabler already being updated to spoof FW 4.87 - Wololo.net
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Jailbreak Any PS3 on 4.89 With PS3HEN! Here's How - YouTube