Ps4 Downgrade Tool -

In 2016, a group of hackers and developers, known as "Specter," released a PS4 downgrade tool that exploited a previously unknown vulnerability in the console's firmware. This tool, also known as "Downgrade Tool" or "PS4 Downgrader," allowed users to downgrade their PS4's firmware from a newer version (e.g., 4.05) to an older version (e.g., 2.76 or 3.55).