If you have the hardware and the skill, the process generally follows these steps:
Downgrading a PS4 from firmware directly to 9.00 via software is not possible . Sony's firmware is designed only to move forward or be re-installed at the same version via a USB drive.
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: The PS4 stores two copies of firmware: the current one and the one immediately preceding it. If your console was on 9.00 and you accidentally updated to 13.02, a skilled technician can theoretically revert it to the previous state .
You must solder your flasher to the motherboard points and create a backup of your current firmware (a "NOR Dump"). If you have the hardware and the skill,
Because only two slots exist, a console currently running firmware 13.02 can only ever be rolled back to the version it transitioned from (e.g., 12.52 or 12.00). It cannot jump back multiple generations to version 9.00 because those historical system files were permanently overwritten long ago. The Reality of "Reverting": Hardware Requirements
First, let’s decode the mystery. In the PlayStation 4 modding and repair community, and 900 are not firmware versions (like 9.00 or 10.01). Instead, they refer to specific error states or internal validation codes related to the console’s NOR flash memory, update integrity checks, or hardware failures. This is a highly technical topic related to
Disassemble the console to access the motherboard.
: 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) .
Write the modified dump back onto the chip.