Technically yes, but impractical for most users.
: Websites claiming to offer a modified "9.00 downgrader pup" file that installs via Safe Mode are completely fake. The console hardware encryption checks will instantly reject these files. ps4 downgrade 13.02 to 9.00
Within the PS4's flash memory (NOR/NAND), cryptographic keys change with major firmware updates. The console will refuse to boot if the software version does not match or exceed the hardware-enforced rollback flag. The Hardware Exception: The Revert Method Technically yes, but impractical for most users
From the PS4’s inception, Sony implemented a hardware-based fuse or anti-rollback system. Inside the console’s Southbridge chip and the main system-on-a-chip (SoC), there exists a set of one-time programmable fuses. Each official firmware update updates certain keys and increments an internal fuse counter. When the system boots, it compares the currently installed firmware’s version number against the fuse count. If the firmware version is lower than what the fuses indicate, the console refuses to boot, effectively bricking itself. Within the PS4's flash memory (NOR/NAND), cryptographic keys