Firmware 9.00 supports the p00p4-jailbreak which is considered highly stable. Newer versions like 13.02 have no known public jailbreak.
This is the only known way to roll back firmware, and it involves physical modification of the console's motherboard. ConsoleMods Wiki How it Works : The PS4 stores the current firmware and the immediately preceding
A "Teensy" board, Raspberry Pi Pico, or specialized reader/writer. PC with specialized tools like "Weeman's Tools". You must disassemble the PS4 and solder wires to the chips to dump their data. Modify Syscon ps4 downgrade 1302 to 900
If the error persists, this is the most reliable method. You will need a USB drive and access to a computer.
Use community tools to modify the dump to trick the console into booting the inactive slot. Write/Flash: Flash the patched data back to the NOR chip. Reassemble & Test. Safer Alternatives to Downgrading Firmware 9
Attempting hardware-level firmware manipulation carries a high risk of permanently "bricking" (breaking) your console.
Before attempting or paying someone to perform this modification, you must understand its strict limitations: ConsoleMods Wiki How it Works : The PS4
⚠️ If your PS4 was updated sequentially (e.g., 9.00 -> 10.01 -> 11.00 -> 13.02), your previous slot will only contain the version directly preceding 13.02, making a direct jump back to 9.00 via this method impossible without historic backups. Method 2: The "Syscon + Nor" Backup Restoral