In 2016, a group of hackers and developers stumbled upon a vulnerability in the PlayStation 4's firmware that allowed them to create a downgrade tool. This tool, which was later released online, enabled users to downgrade their PS4's firmware from a newer version to an older one, specifically from 4.05 to 3.55. This may seem like a minor update, but it had significant implications for the PS4's security and the gaming community as a whole.
The specific JSON link for the game version you want, often sourced from libraries like OrbisPatches ps4 downgrade tool
A Teensy 2.0++, Raspberry Pi, or a dedicated E3 Flasher. In 2016, a group of hackers and developers