: Even with hardware modding, a PS4 can generally only "revert" to the immediately preceding firmware version that was installed on that specific console. If you updated from 12.02 to 13.02, you might revert to 12.02, but jumping all the way back to 9.00 is impossible unless that console was never updated past 9.00 in the past. PS4 Firmware Downgrade: Reverting from 11.02 to 11.00
: Resetting your console clears user data but does not revert the firmware. The Only Way: Hardware Reverting
Open your Syscon backup file inside a specialized hex editor or automated console patching program. The software must locate the specific byte sequences that control the active boot flag. By altering these specific registry values—historically referred to as —you trick the system into booting from the inactive memory area rather than the newly updated 13.02 sector. Step 3: Writing the Patched Images
If your console updated from 9.00 directly to 13.02, the 9.00 data still exists in the backup slot. If your console updated from 11.50, 12.00, or 12.50 up to 13.02, then firmware 9.00 is completely overwritten, and this method will not work. The Hardware Process
If done correctly, the console will boot up using the older firmware stored in the backup slot. Risks and Fake Scams Warning
The short answer is While the homebrew community has made incredible strides, Sony's security measures prevent the simple reinstallation of older firmware via USB or system settings.
: Locate the Serial Flash Memory (NOR) chip and the Syscon chip.
While the main CPU (APU) enforces the rule, the Syscon chip (a smaller microcontroller) holds the truth about your firmware version. Advanced modders have learned to:
What is your for wanting version 9.00 (e.g., playing specific backups, installing Linux, or custom themes)?
If you make a single error while dumping or flashing the Syscon or NOR chip, or if your solder joints bridge, you will permanently brick your console. For 99% of users, this method is impractical. Alternative Solutions for 13.02 Users
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
How to Revert the PS4 to a Previous Firmware (Full Tutorial)