(adsbygoogle = window.adsbygoogle || []).push({}); Ok guys well today im going to show you how to make a patched 3.55 Core_OS.bin you need for downgrading purposes incase your gonna try You must login or register to view this content. you will need to patch a 3.55 Core_OS so i thought i would tell you how and make it a little easier. I have also included at the bottom of the TuT a download link to a 3.55 Patched Core_OS.bin. So lets just go ahead and get started



Things you will need

-3.55 OFW

-.pup extractor

-A firmware .pkg decrypting tool ( I used Waninkoko's tool but you could also use Geohot's tool)

-MFW builder (used to patch the Core_OS. Sorry about using MFW builder but it's the easiest way i found to get it patched and it works)

-Hex editor

Patching Process

1. We need to modify MFW builder so go ahead and open the MFW folder and then open the tasks folder and find the patch_lvl1.tcl file (you can see the file you need to edit in the pic below)

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2. open the .tcl file in Hex editor and set search "\x41\x9E\x00\x1C\x7F\x63\xDB\x78\xE8\xA2\x85\x68\x38\x80\x00\x01" then set replace "\x60\x00\x00\x00\x7F\x63\xDB\x78\xE8\xA2\x85\x68\x38\x80\x00\x01"

Now that your done modifying MFW builder we can move on to the actual patching of the Core_OS

3.Open MFW builder and only apply the lv1 patch to OFW 3.55. Let MFW create the patched .PUP.

4.Now to get the Core_OS so you can patch it into your NOR dump you need to extract the MFW 3.55 .PUP using .PUP extractor

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5. After you extract the .pup you will have a PS3UPDAT.PUP.EXT folder in the same directory as your original .pup file.

6. Now open the PS3UPDAT.PUP.EXT folder and find your Core_OS.pkg it will be in File 7 (like in the pics below) and you also need to get the lvl1.self.

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7. Now you need to decrypt the Core_OS.pkg with the decrypt Firmware .pkg tool.(I used Waninkoko's tool but you could also use Geohot's)

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8. Now that you decrypted that you need to open both LVL1.self and you core_os.bin in a hex editor

9. Now in hex editor select your whole LVL1.self and copy it.

10. In hex editor switch over to your newly decrypted Core_OS.bin and highlight everything between offset 0x0010fb80 and offset 0x0023661f and then paste in your LVL1.self you copied earlier.

11. Now save that Core_OS. (This is your new patched 3.55 Core_OS that you will use to replace your original Core_OS in your NOR dump)

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I patched one for those of you who are haveing trouble making your own download it below.
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Alright guys we couldn't make it anymore easy for you to downgrade we have given you a TUT for every aspect of the downgrading process....so go downgrade and enjoy your homebrew.

can I downgrade my second 3.72 FAT(40GB launch ver) PS3 with this process ?

coolbeanz.

Slim with 120GB?

very informative and easy to understand tutorial thankyou alot!!!