Rebuild database on your PSP → Recovery menu → Advanced → Format flash1 and reset settings. Then copy your backup back over.
A complete inventory of high-level stat-boosting scrolls and ninja tools. Rebuild database on your PSP → Recovery menu
For purists playing on original hardware, you just need a standard USB data cable. or direct folder downloads.
Warning: Avoid sketchy .exe download sites. Stick to .rar, .zip, or direct folder downloads. Rebuild database on your PSP → Recovery menu