[PSP Tools] 6.XX Downgrader v4 Released!

Homebrew developer some1 is back on the scene to release a new version of his modified downgrader, adding support to firmware 6.60 and more!


Changelog:

• Added Support for 6.60
• Fixed 6.60 problem that didn't allow to downgrade to anything greater than 6.20, thanks to Davee
• Allows any updater that is greater than or equal to the factory installed OFW (Has not been fully tested, will most likely work on 500 and up)
• Special Sauce added by Proxima

Developer's note:

After a long wait, here is the port of Davee's 6.35/6.31 downgrader to 6.60/6.39/6.38.

This is a very simple app, just put the desired destination OFW in PSP/GAME/UPDATE, and the app will read the factory installed OFW (aka, the OFW it came with), and allow any updater greater than or equal to this OFW. The range for this has NOT been tested, so I do not know which OFWs it is possible to downgrade to, for which model, but I've tested from 6.60 to 6.20 and 6.35, 6.39 should also work. If you use the wrong updater, the update itself will error out or go back to XMB.

The dev added that the latest update of the downgrader was made possible by Davee's discovery of a new kernel exploit on the firmware 6.60, which he then handed to Zecoxao, who later shared the exploit to him. And just a little reminder before you proceed, be sure to know what you are doing before downgrading.

Tutorial:

[This downgrader only works on firmwares 6.31 / 6.35 / 6.38 / 6.39 / 6.60]
 (Note: If you are on 6.61 or higher your out of luck)

To start select your PSP to download a OFW: (Note: This is OFW 6.20 because a HEN is available for it)

Extract the rar file using 7zip or winRAR. You will then find a file named EBOOT.PBP.


1: Using your PC, create a folder named "PSP". Within the "PSP" folder, create a folder named "GAME". Within the "GAME" folder, create a folder named "UPDATE". (Folder names must be in all uppercase letters).

2: Copy the EBOOT.PBP you downloaded to your UPDATE folder.

Now you have to download a downgrader to downgrade your PSP's firmware to 6.20 OFW. 

(This downgrader works only for 6.31 OFW / 6.35 OFW / 6.38 OFW / 6.39 OFW / 6.60 OFW)

To start


Now extract 6.xx Downgrader.zip file using 7zip or winRAR. You will then find a folder named PSP open it up and you will see a folder named GAME open that up and you will see a folder named 6.xx Downgrader v4

Now copy the 6.xx Downgrader v4 folder to your PSP GAME folder.

3: To start the update data. Select either (Memory Stick) or (System Storage) under (Game) from the home menu, and then select . Press thebutton to start the update.

Then you will see this message. Now you laugh at SONY and Press the button on the downgrader. 

After the SONY updater is finished you will get a BSOD, all you have to do is press button

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Warning!            Warning!            Warning!

If your PSP's motherboard module is 07g/09g, this means you can only downgrade to 6.35 OFW. To find out if you have 07g or 09g you have to download PSP Module Checker v1.0.

To start
MEDIAFIRE, WUPLOAD (MIRROR)

Now extract ModuleCheckerv1.zip file using 7zip or winRAR. You will then find a folder named PSP open it up and you will see a folder named GAME open that up and you will see a folder named ModuleChecker

Now copy the ModuleChecker folder to your PSP GAME folder.

Now run ModuleChecker from the PSP XMB [Game], the program will tell you what module you have.

Here is 6.35 OFW just follow the same instruction as 6.20 OFW, all you do is use 6.35 OFW instead.

Source