: Connect to the Syscon chip using a serial interface to extract its internal memory.

: Use a SPI programmer to read the console's BIOS/NOR chip.

: You will need a programmer like the Teensy 2.0++ , an Arduino Nano , or specialized tools like Wee Tools.

Downgrading PS4 Firmware 9.03 to 9.00: The Reality and the Fix

There is no "software-only" fix to downgrade 9.03 to 9.00. The only verified method is a . How the Reversion "Fix" Works

How to Revert the PS4 to a Previous Firmware (Full Tutorial)