7.55 PS4 Upgrade & Jailbreak - Step by Step Guide - Should you update to 7.55? Realtime Jailbreak. | GBAtemp.net - The Independent Video Game Community
If you own a PS4 Running firmware 4.55 or below, you are on the current golden firmware" - Still true? : r/ps4homebrew
How to Jailbreak Your PS4 on Firmware 4.55 or Lower! | PS4 HEN Tutorial - YouTube