Replacing the internal motherboard of your PS4 with one that is already running 9.00 or lower.
When you perform a standard system update, your "current" firmware version is moved into a backup "slot" on the Syscon, and the new firmware is placed into the main slot. The firmware revert process works by accessing and glitching this Syscon chip into debug mode. Once inside, you can modify the data slots to activate the previous firmware version as the primary boot option, effectively "reverting" the console.
Replacing the internal motherboard of your PS4 with one that is already running 9.00 or lower.
When you perform a standard system update, your "current" firmware version is moved into a backup "slot" on the Syscon, and the new firmware is placed into the main slot. The firmware revert process works by accessing and glitching this Syscon chip into debug mode. Once inside, you can modify the data slots to activate the previous firmware version as the primary boot option, effectively "reverting" the console.