Downgrade Tool Ps4 Repack [patched]
Many tools claiming to downgrade via USB are technically spoofers. They modify the system file version.txt to report a lower version number to the user interface. This does not actually downgrade the kernel or security modules. A true downgrade requires the replacement of the firmware binaries in the NOR flash.
Downgrading a PS4 is not a simple software update. It carries significant risks: Hardware Modification: downgrade tool ps4 repack