7.55 PS4 Upgrade & Jailbreak - Step by Step Guide - Should you update to 7.55? Realtime Jailbreak. | GBAtemp.net - The Independent Video Game Community
GitHub - devSchnitzel/unified-exploit-host-1.01-5.55: Unified Al-Azif exploit host from 1.01 to 5.55 (payloads included for 4.55 and 5.01/5.05 (MiraCFW))
PS4: How to get your hands on a PS4 with firmware 7.55 or lower - Wololo.net
PS4: Specterdev publishes writeup on the 5.05 exploit - Wololo.net
PlayStation Scene Devs on Future PS4 Jailbreak Exploits and Homebrew | Page 5 | PSXHAX - PSXHACKS