PS4 7.50 and 7.55 Jailbreak is Available - Ouralo PS4 - Ouralo
PS4 Jailbreak confirmed to work on 7.55, some issues remain and are being worked on - Wololo.net
PS4 7.50 Kernel Exploit via Sleirsgoevy, 7.55 May Come in a Few Days! | Page 2 | PSXHAX - PSXHACKS
7.55 PS4 Upgrade & Jailbreak - Step by Step Guide - Should you update to 7.55? Realtime Jailbreak. | GBAtemp.net - The Independent Video Game Community
Update: Mira ported to new PS4 FW 7.55 exploit... - Hackinformer
PRB 7.55 ESP8266 Exploit Menu v4 SL Update 3 | PS4 7.55 Jailbreak | Full Tutorial | Orbis Toolbox - The GamePad Gamer