from firmware directly to 9.00 is not possible through software alone and is extremely difficult even with hardware modifications.
If your PS4 is on genuine 10.xx or above, no public software method can downgrade to 9.00. You risk bricking.
Because of the high demand for the gold-standard 9.00 jailbreak, search results for keywords like "PS4 downgrade 13.02 to 9.00 top" are heavily saturated with malicious sites and fake tutorial software. Firmware Revert - ConsoleMods Wiki ps4 downgrade 1302 to 900 top
: As a protective measure against failed or corrupted software updates, the PS4 stores data for two firmware versions simultaneously. These are broken down into Slot A (Active Slot) and Slot B (Backup/Inactive Slot) .
Firmware 9.00 is a "top" target because it is the most stable version for running homebrew applications from firmware directly to 9
If your PS4 is currently on official firmware 10.01 (often nicknamed "1302" in some hacking circles or confused with PS5 firmware versions) or anything higher than 9.00, you cannot downgrade to 9.00.
When updating from a lower firmware to version 13.02, the console overwrites the inactive slot with 13.02, verifies its system files, and shifts the boot priority to that slot. Because of the high demand for the gold-standard 9
: Depending on the method, you may need:
This technique has limitations. Most critically, it only works if your Syscon chip is of a specific model. It must be an A0X-COLX (where X is a number on the chip) for it to be compatible. Furthermore, you cannot revert to a firmware version that wasn't previously installed. The principle is simple: you can only revert to the immediate prior version your console has been on.
Here’s a properly structured, informative piece covering the error codes (often informally referenced as “1302” by some users) and CE-34878-0 (commonly mislabeled “900” in downgrade contexts), along with the concept of downgrading from a higher firmware (e.g., 9.00) to a lower one (e.g., 5.05/6.72) .
: You must interface with the Syscon and NOR chips using specialized tools like a Teensy 2.0++ or a TNC (Tiny Jumper Cable) module . The "Revert" Method (Hardware Only)