https://fail0verflow.com/blog/2017/ps4-namedobj-exploit/
https://github.com/Cryptogenic/PS4-4.05-Kernel-Exploit
A fully implemented kernel exploit for the PS4 on 4.05FW. In this project you will find a full implementation of the “namedobj” kernel exploit for the PlayStation 4 on 4.05. It will allow you to run arbitrary code as kernel, to allow jailbreaking and kernel-level modifications to the system. This release however, does not contain any code related to defeating anti-piracy mechanisms or running homebrew. This exploit does include a loader that listens for payloads on port 9020 and will execute them upon receival.
https://www.youtube.com/watch?v=KLkKql31d44
Firmware Security 