: Use a SPI programmer to read the console's BIOS/NOR chip.
Until a full downgrade is possible, here is the for 9.03 users who want to play backups.
from , it is essential to understand that there is no "software-only" fix. Because Sony does not allow firmware downgrades through the system menu or Safe Mode, you must use a hardware-based method known as a Firmware Revert . The Requirement: The "Slot" System
(e.g., a written document or a “paper” from a developer), please clarify — but regarding downgrading, the answer remains: not possible on 9.03 .
: By patching the data, you force the PS4 to fail over to the backup slot containing the older firmware. Reinstall Firmware