Sony designed the PlayStation 4 with a secure boot sequence to prevent users from rolling back to older, vulnerable firmware. When a firmware update runs, the system permanently logs the update index. It blows virtual electronic fuses (efuses) inside the Main Processor (APU).
To fully disassemble the console. Step-by-Step Technical Overview of the Revert Process downgrade ps4 903 to 900 fix
| Feature | 9.00 (Jailbreak) | 9.03 (PPPwn) | | :--- | :--- | :--- | | Rest Mode | Works | Broken (Crashes) | | USB Exploit | 99% stable | N/A | | Backups (PKG) | Yes | Yes | | Linux Loader | Yes | No | | Stability | High | Low (Requires reboot often) | Sony designed the PlayStation 4 with a secure
: When you update from 9.00 to 9.03, the 9.00 firmware isn't deleted immediately; it is moved to an inactive "backup" slot on the Syscon chip. To fully disassemble the console
Normally, Sony prevents downgrading. When you update from 9.00 to 9.03, the PS4 updates its internal system registry to prevent the older version from booting. Simply installing 9.00 via USB will result in a "The update file is corrupted" (SU-42118-6) error. The Firmware Revert Method (Hardware Mod)
Downgrading a PS4 from firmware 9.03 to 9.00 cannot be done through a simple software update or USB flash; it requires a complex hardware process known as Summary of the Reversion Method
Your best option is to wait or seek out a professional repair service that specializes in console modding.