You cannot downgrade by simply swapping the hard drive or using a USB stick. To revert to a lower firmware (like 11.00 or 12.00), you must perform a hardware-based revert. 1. Hardware Requirements
The PS4's firmware is based on a Linux kernel and uses a secure boot mechanism to ensure that only authorized firmware can be executed. The firmware is composed of several components, including the kernel, the initramfs, and the firmware itself. The secure boot mechanism uses a chain of trust to verify the authenticity of each component before executing it.
Why someone might want a downgrade
However, this is a last-resort, high-skill operation. It requires extensive technical knowledge, specialized equipment (micro-soldering tools), and a high tolerance for risk, as a mistake can permanently brick your console.
If you'd like, I can look for or search for the current jailbreak status of specific lower firmware versions (like 11.00 or 13.00) to see if a downgrade is worth the effort. ps4 downgrade 1302 upd
These procedures typically involve a full initialization of the system, resulting in the loss of all saved games and personal data. Conclusion
You had a PS4 on firmware 9.00 or lower—versions with known jailbreaks—and accidentally updated to 10.00, 11.00, or 12.00. Now you want to roll back to 9.00 to regain homebrew access. You cannot downgrade by simply swapping the hard
Working with that are unique to your specific console ID; you cannot simply swap in another console's backup.
: Soldering errors or incorrect data patching can permanently disable your console. Hardware Requirements The PS4's firmware is based on
Downgrading a Go to product viewer dialog for this item. from firmware version is a complex process that primarily relies on a "Revert" method rather than a simple software installation. Because Sony's official system software prevents installing an older version over a newer one, this procedure requires advanced hardware manipulation. 1. The Core Mechanism: Hardware Reversion