Things You'll Need
Instructions
Download Rain's MMS Maker from the PSP Hacks website. Right-click the downloaded file and select "Extract here." Plug the Memory stick into your computer's memory card slot. If your computer does not have a memory card slot, plug the memory stick into your PSP and connect it to your computer with a USB cable.
Double-click Rain's MMS Maker. This will open up a window. Select "4.01 ofw/m33-2" from the first window. Click on "Load EBOOT."
Select your PSP driver from the second window, and click Make MMS. When the program is done creating your MMS it will pop up a window letting you know it is finished.