Downgrading a Go to product viewer dialog for this item. from firmware directly to 9.00 is currently impossible through software alone . Sony's firmware architecture only allows for a "revert" to the version immediately preceding your current update. The Reality of PS4 Downgrading
There are currently only two primary ways to "revert" firmware, both of which are technically demanding: ps4 downgrade 13.02 to 9.00
before your current one. If you were on 13.00 before 13.02, you can only go back to 13.00—not all the way to 9.00—unless you have a physical backup of your console's unique data from when it was actually on 9.00. The Technical "Deep Story": How Reversion Works Downgrading a Go to product viewer dialog for this item
A: The firmware kernel is stored partially in the Syscon chip and partially on the NOR flash of the motherboard. Replacing the HDD will not downgrade your firmware. The Reality of PS4 Downgrading There are currently