Even with advanced hardware soldering, you can usually only revert the PS4 back to the immediately preceding firmware that was installed on that specific console before the last update. You cannot freely jump from a high firmware (like 11.00+) back down to a low firmware (like 5.05 or 9.00) unless that specific console was on that firmware directly before updating. 🛡️ How to Safely Mod a PS4
If your goal is to run homebrew or jailbreak your console, you should look for legitimate methods rather than fake downgrade tools. ps4 tool downgrade v100 exe link download
Tools for modifying or downgrading PS4 firmware have evolved over time. However, due to the sensitive nature of these tools and the potential for misuse, direct links to such software are not provided here. Even with advanced hardware soldering, you can usually