How to Downgrade Your PSP to Version 1.5 Using Your PSP Battery

Step-by-Step Guide

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   Step 1: Before you get started with the downgrade

   If you don’t know how to reformat it, you can refer to the steps below: ,,, Push the "X" button again to select this option.,, 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.,
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   Step 2: you need to reformat your PSP memory stick.

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   Step 3: Press the HOME button on the bottom left of your PSP.

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   Step 4: Use the arrow keys to move to the Settings area

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   Step 5: then move the up and down keys to go to System Settings.

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   Step 6: Push the "X" button (or the “O” button

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   Step 7: depending on which button is the “Enter” button of your PSP) and scroll to find the “Format Memory Stick” option.

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   Step 8: Your PSP will now confirm that you want to reformat the memory stick

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   Step 9: choose Yes and your PSP will be physically formatted in a few seconds.

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    Step 10: To do the downgrade

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    Step 11: you also need to download an application pack.

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    Step 12: Now you are ALL ready to turn your PSP battery to a Pandora’s battery and use it to downgrade any PSP!

Detailed Guide

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