"PS4 Syscon Tools is a free solution (software & hardware) that allow you to manipulate original PlayStation 4 Syscon chip (Renesas RL78/G13). It consists of 2 projects:

* PS4 Syscon Tools (PC client to allow you to control your PS4 Syscon Flasher hardware).
* PS4 Syscon Flasher (Hardware flasher based currently on Teensy++ 2.0 - Teensy 4.0)."

https://github.com/AbkarinoMHM/PS4SysconTools