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There is technically one way to revert firmware, but it is extremely difficult and risky:
You use a computer to read and extract the raw binary data (the "dump") from both chips.
There are currently only two primary ways to "revert" firmware, both of which are technically demanding: ps4 downgrade 13.02 to 9.00
You cannot downgrade firmware 13.02 via USB. Even recovery mode (Safe Mode #7 - Initialize PS4 (Reinstall System Software)) requires a firmware version equal to or higher than your current installed version. Since version 9.00 is lower than 13.02, it will never work.
Development models such as are capable of downgrading, but this does not apply to retail consumer consoles. There is technically one way to revert firmware,
Modify the Syscon chip firmware to force the console to boot from the previous firmware slot instead of the active 13.02 slot. The Catch: The "Current-Minus-One" Rule
The only technical way to "downgrade" a PS4 is not actually a downgrade, but a hardware restoration process known as the . Since version 9
The PS4 motherboard contains two firmware slots (Slot A and Slot B). When you update your console, the new version is installed in the inactive slot, and the old version remains in the other. ConsoleMods Wiki The Limitation : You can only revert to the