Early PS4 Pro models (CUH-70xx) had a brief vulnerability where shorting two pins on the motherboard could reset the minimum version. This was patched in later hardware revisions. Even then, it only worked on firmware 6.72 or lower. No known glitch works on 10.00+.
The software finds the "switch pattern" in the data and alters it to tell the console, "Your active firmware is corrupted; please use the backup version in Slot B instead". sistrodowngradeps4
This is a high-stakes modification that carries a significant risk of permanently "bricking" (disabling) the console. Early PS4 Pro models (CUH-70xx) had a brief
If backward compatibility or specific features are needed, use a secondary console or explore official alternatives rather than attempting downgrade. No known glitch works on 10
If your PS4 was on firmware 5.05, and you updated it multiple times over the years up to 12.00, you cannot use this method to jump straight back to 5.05. The Risks and Challenges of Downgrading