Use the tool's built-in script functionality to intentionally corrupt the active boot flag of the current firmware slot.
If you are considering this process, be sure to look at Reddit forums to see if any new breakthroughs have been made, or if others have successfully used a specific tool or service to revert their firmware.
Currently, there is no software-only method to downgrade a PS4 from firmware 13.02 to 9.00. ps4 downgrade 1302 to 900 top
: Set up your PS4 again.
The PS4's firmware versions are stored in a read-only memory (ROM) and are verified through a cryptographic signature. To downgrade, a user must: : Set up your PS4 again
Hardware interfaces built specifically to alter Syscon controller states.
: The console is completely dismantled. The SPI reader is connected to the console's NOR flash memory to extract the main data dump, and the Syscon chip's memory is dumped. : The console is completely dismantled
: The PS4 motherboard maintains two firmware "slots": one for the active version and one for the version immediately preceding it.