Every PS4 motherboard contains a chip. This chip acts as the gatekeeper of the console. It stores the console's "lowest firmware version" history. When Sony releases a system update, it often includes updates to the Bleeding Edge secure bootloader.
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Requires physical hardware modification (micro-soldering) to the SYSCON chip and a NOR programmer.
Firmware 13.02 is fully patched against known user-land exploits. There is no public browser or kernel exploit available for this version that allows for a "soft" (software-only) downgrade.
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firmware 13.02 to 9.00 using a USB flash drive or system formatting is entirely impossible. The PlayStation 4
The Ultimate Truth About Downgrading a PS4 from Firmware 13.02 to 9.00
Sony's security prevents the console from accepting any firmware with a lower version number than the one currently installed.
You will need specific hardware and software: Every PS4 motherboard contains a chip
The primary reason is that Sony's security architecture is very robust. The PS4 firmware isn't just stored on the hard drive. Part of it is burned into a read-only, encrypted chip on the console's motherboard that keeps a permanent record of the latest firmware version installed. Trying to install an older firmware via USB will simply fail because the console's hardware will prevent it. Swapping the hard drive to an older one also won't work; the console will still refuse to boot the older system software.
Answer key / model responses (for graders)
This involves using an external modchip to intercept the communication between the Southbridge chip and the APU during bootup. By introducing precise electrical noise (glitching), the security checks can occasionally be bypassed, allowing unsigned or older code to execute.
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Note: You cannot use a backup dump from another person's PS4. Doing so will permanently brick your console because the files are mathematically tied to your specific motherboard's secure processor. Beware of Scams and Fake Software Downgraders
Modifying the system UI, installing custom boot logos, and controlling fan speeds. The Core Concept: How PS4 Downgrading Works
The most responsible recommendation for an average user wanting features from an older firmware is: A) Attempt unofficial downgrade right away B) Consult official Sony support or authorized service C) Post console serial on forums for help D) Remove the motherboard and mail it to a forum admin
Your PS4 (e.g., CUH-1200, CUH-2000 Slim, CUH-7000 Pro) If you have prior soldering experience