PS4's with FW4.05 & 4.55 can now play PS2 backups/ISO images!! - Hackinformer
New PS4 Jailbreak Hits Firmware 4.55, Excites the Masses * TorrentFreak
7.55 PS4 Upgrade & Jailbreak - Step by Step Guide - Should you update to 7.55? Realtime Jailbreak. | GBAtemp.net - The Independent Video Game Community