However, the PS4 motherboard stores two firmware versions at any given time: an and an inactive slot . When you update, the new firmware occupies the inactive slot and then becomes active, leaving the previous version in the other slot. This allows for a "reversion" to the version that was installed immediately before your current one. Critical Prerequisites for 9.60 to 9.00

Downgrading your PS4 firmware can be unpredictable, and there are risks involved. If something goes wrong during the process, your console might:

To revert back to 9.00, you must perform a hardware mod involving:

: This article is for educational purposes only. The author and the website are not responsible for any damage or bricking of your PS4. Proceed with caution and at your own risk.

: Connect the flasher to a PC and use software to read and extract the current firmware data (dumping the NOR and Syscon).

Boot the console into Safe Mode. It should now accept a standard recovery installation file for firmware 9.00. Alternative Solutions

The only legitimate way to revert a PS4 running firmware 9.60 back to 9.00 is through a complex hardware modification known as the or Syscon Flashing method. This process relies on a physical loophole rather than a software exploit. How the Revert Works

The PS4 uses two "slots" on the motherboard (Slot A and Slot B) to store the current and previous firmware versions as a failsafe. ConsoleMods Wiki Syscon and NOR Damping : You must dump the data from the console's (system controller) and (flash memory) chips using the Teensy microcontroller. Patching & Slot Switching : Using tools like PS4 Syscon Tools PS4 Wee Tools