The console must have updated to its current firmware directly from the immediately preceding firmware version. You cannot jump backward across multiple major updates.
No tool, now or in the foreseeable future, can magically downgrade a retail PS4 to launch‑day v1.00 with a simple USB drive or a downloaded executable. The security measures put in place by Sony are robust, and the modding community’s achievements have all come from working within those constraints. ps4 tool downgrade v1.00
The PS4 naturally keeps a backup of the previous firmware in a secondary "slot." The v1.00 tool often attempts to trigger a switch back to this inactive slot. 2. Software Exploitation The console must have updated to its current
Solder a specialized hardware programmer (like a Teensy, Raspberry Pi, or Teensy 4.0) to the Syscon and NOR chips. The security measures put in place by Sony
If your goal is to roll back the PS4's system firmware to a jailbreakable version—and especially to a mythical version 1.00—you must understand that no simple tool exists. The reality is a complex, high-risk, and expensive hardware modification that is only possible under specific circumstances. The discussions online about this topic almost always refer to the simpler game downgrade.
Firmware 1.00 was the factory-installed version on launch-day PS4s. It had massive security holes, including: