Switch out the pandora's battery and put in the regular battery.ħa. press X again to complete the install and the PSP will shut off.Ħ. After it is completely installed, flashed, etc. When the black menu pops up, hit X to downgrade. For older versions, turn off the PSP, restart holding L to get to the menu.Ĥ. For newer versions of the PSP grader, the menu will pop up automatically.ģb. MAKE SURE THE BATTERY IS SECURE, DOESN'T FALL OUT OF PLACE!ģa. Put both the magic memory stick and the pandora's battery in the PSP. Now assuming that you have both the pandora's battery and the newly made magic memory stick in hand, you are ready to downgrade your PSP.ġ. It is easier to just buy one than to make one. Point the drive of your PSP memory card in the last field. Put the 150 and the 390 pbp files in their respective fields.ĥ. Connect your memory card to your computer via your PSP or an adapter.Ĥ. Using PSP grader and the two firmware files (150 and 390):ġ.
As of writing this, 4.01 still has a few compatibility issues, so it is recommended you do not upgrade to 4.01)įirst, you will need to make a magic memory stick.
(although you should look for the M33-3 version since it is the best. So you can have 3.90 M33, 3.90 M33-2, and the 1.50 kernels respectively and PSP grader will put those onto the memory stick. It also doesn't matter what firmware you get since PSP grader will "patch" them onto your memory stick. *No matter which versions of 3.90 M33 you get, make sure they match. Pandora's Battery ($10.50 at dealextreme) There is a tutorial already on romulation on how to upgrade your PSP to custom firmware, but you need a very early firmware to do so. I wrote this because there are very few useful tutorials that guide you step by step on how to downgrade. Firstly, this is only for PSPs that have official firmware well past 3.40.
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