Evaluate whether attempting to downgrade a PlayStation 4 from firmware 13.02 to 9.00 is feasible, safe, legal, and worth pursuing.
HDD Swapping: Replacing or formatting your hard drive will not change the firmware version. The firmware is stored on the console's internal chips, not the hard drive. ps4 downgrade 13.02 to 9.00
The only way to revert a PS4 to an older firmware is through a complex hardware-based process known as "Revert," which has significant limitations. The "Revert" Method (Hardware Only) Quality column: PS4 downgrade 13
Targeting 9.00: To go all the way back to 9.00 from 13.02, your console must have sat on firmware 9.00 immediately before you updated to 13.02, without any intermediate updates (like 10.00, 11.00, or 12.00) in between. Community guides exist but vary in accuracy; following
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Existing Backups: You can only revert firmware if you previously made a physical backup of your own console's sflash, syscon, and HDD while it was still on that lower version. You cannot use files from a different console. Current Jailbreak Landscape (Firmware 13.02)