If you cannot get version 5.7.4 working, consider these alternatives:

This specific version is part of a series of community-distributed updates. While popular in forums, users often report stability issues, as adding more content to the limited PSP RAM (32MB or 64MB) causes worlds to crash or fail to save. Downloading and Installing (General Homebrew)

: Open the game from the Game > Memory Stick menu on your PSP.