Hardware like the Teensy or TC++ 2.0 is required to dump and patch the console's internal chips. The Downgrade Process (Overview)
This process is not possible without soldering . You must physically open the console to access the NOR and Syscon chips.
✅ ✅ New UI ✅ Stable Release
is one of the primary motivations. Many older versions of games contain exploits, glitches, or developer menus that can make challenging trophies easier to obtain. As noted in community discussions, "the latest version of Mafia 3, there are some glitches that prevent certain trophies from unlocking, but the older 1.09 version doesn't have this issue". Similarly, in Final Fantasy 15, the comrades mode was removed in later patches, making the associated trophies unobtainable unless you can access an older version.
On your PS4:
To understand why a simple software tool cannot downgrade a PS4, you have to look at the console's internal architecture. The PS4 prevents software downgrades using physical hardware checks:
to connect to the console's NOR and Syscon chips. ps4 tool downgrade v100 new
We are pleased to announce the release of the new PS4 Tool Downgrade v1.0.0. This is the first official stable build of the utility, designed to provide a smoother and safer downgrade process for supported firmware versions.
Understanding the methods, risks, and functional tools required is essential before attempting to revert your console or game software. Console vs. Game Downgrading: The Core Distinction Hardware like the Teensy or TC++ 2
How to Revert the PS4 to a Previous Firmware (Full Tutorial)