Reassemble the console, boot into Safe Mode (hold power for 7 seconds), and install PS4UPDATE.PUP for 9.00 via USB.
Firmware 10.50, however, patched the critical BD-JB (Blu-ray Disc Java) exploit used in 9.00. Sony also introduced stricter anti-rollback mechanisms. Once you install 10.50, the console physically burns "fuses" (e-fuses) inside the Syscon chip that prevent the system from ever booting an older firmware again. If you search YouTube, you will see videos titled "PS4 Downgrade 10.50 to 9.00 in 2 Minutes!" with a flashing download link. These are 100% scams or virus traps. ps4 downgrade 10.50 to 9.00
Using your programmer, read the current e-fuse configuration. This tells you how many times the console has been updated. Reassemble the console, boot into Safe Mode (hold
You must modify the Syscon dump to reset the "minimum version" counter from 0xA (10.50) back to 0x9 (9.00). This requires hexadecimal editing. Once you install 10
If you’re here, you likely made the same mistake thousands of others did: You accidentally updated your PS4 to firmware 10.50, or you bought a used console that came with it pre-installed. Now, you’ve heard the legends of the "golden firmware" 9.00—the last truly exploitable version for the PS4.
Let me save you hours of frustration:
You want to go back. You want to downgrade.