PS3 News: Firmware 4.85 released and HFW 4.85.1 already released by Joonie allowing for unsigned code execution - Joonie recommends not to install FW 4.85 until all tools are updated! - Wololo.net
PS3 - 4.87.1 PS3 HFW (Hybrid Firmware) - HFW is helpful for installing PS3HEN on 4.84/4.85/4.86/4.87 FW | Page 80 | PSX-Place
OLD] How to Jailbreak Your PS3 on Firmware 4.85 or Lower! - YouTube