75%.
The skill required to micro-solder on a Syscon chip (which has pins smaller than a grain of rice) is immense. One bridge between two pins will kill the motherboard.
Sony enforces firmware restrictions using two primary hardware and software security layers: ps4 downgrade 13.02 to 9.00
"Here goes nothing."
You must solder fine wires directly to the microscopic pins of the Syscon and NOR flash chips on the PS4 motherboard. He could back up his discs to the internal SSD
In the world of console modding, few phrases generate as much hope—and as much confusion—as "PS4 downgrade." As of 2026, with Sony pushing system software updates well into the version 13.xx range, a growing number of users are asking a specific question: How do I get back to the golden firmware 9.00?
Suddenly, the console he had bought off the shelf was his again. He could back up his discs to the internal SSD. He could overclock the fan speeds. He could run emulators for retro games that Sony would never allow on the store. He wasn't playing by Sony's rules anymore; he was playing by his own. Using specialized PC software
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
Using specialized PC software, modifiers patch the Syscon's internal register to trick the console into booting from the previous firmware slot.
If your goal is a stable 9.00 system, the safest, cheapest, and least stressful route is often market rotation:
Requires soldering and specific update history. Best Current Option