In this article, I will show you how to downgrade PS4 system software easily. PS4 is an eighth-generation home video game console developed by Sony.
Here are the 3 Ways to downgrade PS4 system software.
1. Use off-market site Software
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To downgrade your PS4 you will need to download the software from an off-market site, load it to an external or thumb drive and flash the OS. The instructions on exactly how to install the OS will vary based on who or where you got the OS from.
The risky part is, if anything goes wrong there is no ‘factory reset’ or ‘system restore’ like Android and Windows devices (respectively). If you try to install an incompatible or corrupt OS then it’s game over and you’re left with an expensive paperweight.
2. Use PS4 recovery mode
First, google how to put the PS4 into recovery mode, then download 5.05 onto a thumb drive. You will then be given options on the ps4 and you will select the thumb drive option.
This will work but you can’t be on the internet at all or PlayStation will update.
3. Initialize your PS4 from it’s bios
First, you need to Initialize your PS4 from its bios. Then download the 4.55 version and install using a USB drive. Here’s what will happen after you do it. All your data will be gone if you don’t save them in another PS4. And after you start the system, it’ll automatically update to 4.05.
Reasons Why its Difficult to Downgrade PS4
There are many reasons why PlayStation4s cannot be downgraded yet, two of them have to do with the NOR Chip and the Syscon.
In order to proceed to a Downgrade, you’ll need special privileges to the Syscon and NOR Chip, something HEN doesn’t grant you, since its a Homebrew Enabler, it doesn’t grant you any System Firmware access, and then there its the NOR and Syscon themselves, at the moment nobody knows how they work, nor the proper tools are available for that.
Dumping the NOR it’s possible, but Flashing a Custom Code to it its impossible, $ony learned that from the PlayStation3s Syscon Chip which works in conjunction with the NOR.
I know the DUH-1000A PlayStation4 Development Kit with the CVN-K12 Board can be a downgrade, all of them have special proprietary software to perform the downgrade, reports suggest that the DUH-7000AA PlayStation4 Pro Development Kit SC58 SKU’s cannot be downgraded in any shape or form, due to a newer Syscon and NOR Chip, so there rises another problem, which even if a downgrade was made possible, it might be reserved to the earlier retail units with boards from SAA-001 to SAC-001, that’s being the CUH-1000/1100 and 1200, Slims might be a 50/50% Chance if they use the Older Syscon Chip, but if they do use a revised PS4 Pro Syscon Chip, then it might not be possible, once such discovery will be made.
Your PS4 HDD is encrypted and will not show on your pc by default.
You will need to delete the Partition and make a new one and format it to suit your OS (Windows – NTFS, Mac – Mac OS X Journaled, etc. you get my point.)
After deleting the partition you can’t look clues or anything in the data because it’s all gone.
Upgrading your PS4’s Firmware is like writing a Program on your HDD and editing the ROM on the motherboard to use that data on HDD to bring changes to the system.
Once you are on the higher Firmware your Mainboard’s ROM is upgraded and if you Format the HDD and tries to flash a Lower FW(5.05) it will not match with the ROM’s instructions or even pass the security check.
Now you can’t edit the ROM as the exploit we use is a Kernel level, not hardware level.
Exploiting the Kernel will only give you access to the Software part i.e., the FW functionality, this is how HOMEBREW is possible.
And before Kernel comes into play the ROM check on the HDD and checks the integrity of the system so it can further load the OS files on to the system memory (RAM).
I hope it helped you understand the situation better. I even hope we get a way to overcome this issue in the future but this is how it is for now. So we suggest you buy a new PS4.