To "fix" the version and return to 9.00, you must physically manipulate the console's and NOR chips to force the system to boot from the inactive slot. Requirements for the Downgrade
The PS4 motherboard contains two "slots" for firmware: (active) and Slot B (inactive).
: Flash the patched data back to the chips and attempt a boot. Critical Warnings downgrade ps4 903 to 900 fix
If you updated your PlayStation 4 to firmware 9.03, you likely realized too late that you missed out on the , which is only compatible with firmware 9.00 and below. While many online sites claim to offer a simple USB download to "fix" this, the reality is more complex.
: Use software tools to modify the "slot" indicators in the Syscon dump, tricking the console into thinking 9.00 is the active version. To "fix" the version and return to 9
This process is highly technical and requires hardware modification:
Downgrading PS4 Firmware 9.03 to 9.00: The Reality and the Fix Critical Warnings If you updated your PlayStation 4
: You must create 1:1 backups of your current firmware data before patching them to switch slots. Step-by-Step Overview (Technical)