Here is my easy installation guide for HFW 4.84 to CFW Rebug, Habib, or Ferrox : r/ps3homebrew
How to Uninstall PS3 CFW or PS3HEN | Revert to Stock OFW - 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