: Flash the patched data back to the chips and attempt a boot. Critical Warnings
[1] Select PS4 Firmware: 9.03 → 9.00 [2] Choose 9.00 PUP file: C:\firmware\PS4UPDATE.PUP [3] Connect PS4 via USB cable (Bridge mode) [4] Click "Start Downgrade" → Status: "Sending webkit payload to 9.03..." → Status: "Kernel exploit succeeded" → Status: "Disabling anti-rollback..." → Status: "Flashing 9.00 – DO NOT POWER OFF (12 min)" [5] Done! PS4 will reboot to 9.00. downgrade ps4 903 to 900 fix
Use a file comparison tool (or MD5 checksum generator) to verify that all three dumps are 100% identical. If the checksums match, your dump is clean. Save this file securely as sflash_orig.bin . Step 3: Modifying the SFLASH Image (The Slot Swap) : Flash the patched data back to the
On the PS4 motherboard:
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) Use a file comparison tool (or MD5 checksum