Lots of users downgrade their PSP to version 1.5 because they can upgrade their PSP to any version from 1.5. And if you upgrade your PSP to version 3.51, you can play any downloaded games and run any applications. Do you know that you can downgrade your PSP system to version 1.5 all by yourself by turning your PSP battery into a pandora’s battery? All you need are an original PSP battery (with more than 50% charge) and a Memory Stick Pro Duo with 1GB memory or above.

I. Get ready (Reformat PSP memory stick)

Before you get started with the downgrade, you need to reformat your PSP memory stick. If you don’t know how to reformat it, you can refer to the steps below:

1.Press the HOME button on the bottom left of your PSP. 2.Use the arrow keys to move to the Settings area, then move the up and down keys to go to System Settings. 3.Push the "X" button (or the "O" button, depending on which button is the "Enter" button of your PSP) and scroll to find the "Format Memory Stick" option. Push the "X" button again to select this option. 4.Your PSP will now confirm that you want to reformat the memory stick, choose Yes and your PSP will be physically formatted in a few seconds

To do the downgrade, you also need to download an application pack. Click Download Pandora Battery Application Pack (Find the Guides label on the right side,which named Download for PSP downgrade application). After the downloading is finished, what you get will be a compressed application pack named "pandora", decompress it to the root directory of a hard disc, say Disc H. In this "pandora" folder, you can see four folders including mspformat, msinst, battery and installer, and a file named UPDATE.PBP.

Now you are ALL ready to turn your PSP battery to a Pandora’s battery and use it to downgrade any PSP!

II.Turn your PSP battery into a padora’s battery

Step 1: Logically reformat your PSP Connect your PSP to your computer. And your PSP will be recognized as a new hard disc, say K. Then click Start -> Run, input cmd in the popped up dialog box, and click OK to enter DOS system. Use the below commands one by one to run the mspformat file:

Input "H:", and press the "Enter" Key on your keyboard. (Here H is the disc where the "panndora" folder is located)

Input "cd pandora" and press the "Enter" Key on your keyboard. Input "cd mspformat" and press the "Enter" Key on your keyboard.

Then input "mspformat.exe K" and press the "Enter" Key on your keyboard. (Here K is the name of the disc that your PSP is recognized on your computer.) After these commands, your PSP will be logically reformatted in a minute.

Step 2: Open the recognized PSP hard disc on your computer, create a new folder and name it "psp", open this "psp" folder, create a new folder and name it "game". Copy and paste the "installer" folder and the "battery" folder into the "game" folder. Then copy and paste the UPDATE.PBP file to the root directory of the PSP hard disc on your computer.

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