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Every firmware update alters the cryptographic keys used to read data from the internal Hard Disk Drive (HDD). If you try to force an older firmware installation using an external storage drive, the console will fail to decrypt its own system files, resulting in a boot loop or a corrupted storage error message. The Revert Method (Hardware Downgrading)
To understand the impossibility, one must first appreciate why firmware 9.00 is so coveted. Released in September 2021, version 9.00 was the last major firmware for which a reliable, user-mode exploit (often paired with a specific USB exfiltation technique) was publicly developed. This exploit allows for the loading of homebrew software and backup titles, but it is a fragile, temporary jailbreak that must be reapplied after each reboot. Firmware 13.02, in contrast, is a modern, patched version released in early 2024. It closed the specific vulnerabilities present in 9.00 and introduced more robust system-level integrity checks. ps4 downgrade 13.02 to 9.00
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Every firmware update alters the cryptographic keys used
: Modifying specific bytes of data using dedicated software tools to manually tell the console to read from its previous firmware slot. Released in September 2021, version 9
The PS4 motherboard contains two primary chips responsible for storing system memory and tracking firmware states: the (stores the CoreOS) and the Syscon Chip (the system controller that handles power, security, and update checks).
You can only revert back to 9.00 if your console was . If you updated from 9.00 directly to 13.02 via a single update, version 9.00 remains untouched in the backup slot. If you updated incrementally (e.g., 9.00 →right arrow →right arrow →right arrow
The chips are wired into a hardware flasher (like a Raspberry Pi Pico or Teensy board) to dump the raw binary data onto a PC.