Thread: Downgrading Custom Firmware (OE / M33)

Note: This guide is for use with regular PSP units only, the following steps are not to be performed on a PSP Slim.

Want to go back to a previous OE revision or have decided that custom firmware is not for you? Here is how to downgrade your new custom firmware installation in five easy steps.

[Only Registered users can see links . Click Here To Register...]
[Only Registered users can see links . Click Here To Register...]

It's important that you download the recovery ZIP corresponding to your firmware version.

• Extract the Recovery ZIP.
• Place the "RECOVERY" or "UPDATE" folder in X:/PSP/GAME/
• Download the [Only Registered users can see links . Click Here To Register...], save as file name "UPDATE.PBP"
• Move "UPDATE.PBP" into the same folder you placed on your memory stick in Step 1.
  
  If you are running custom firmware 2.71 - 3.52
• Everything is setup! Hold R while turning on your PSP to enter recovery mode, and choose the option which reads "Run program at.." to begin downgrading to firmware 1.5.
  
  If you are running custom firmware 3.71
• Navigate to the Game menu and launch "Update to X.Y.Z." You may be asked to patch your idstorage keys, if so, press X.