The most famous of these projects is (and various community modders who continued the work). The "3.2.1 fat" designation refers to:
Disconnect and navigate to the Game > Memory Stick menu on your PSP XMB to start the game. Known Limitations & Successors minecraft psp 3.2.1 fat.zip
Use 7-Zip or WinRAR to extract the ZIP file. Look for a folder named MCPSP_3.2.1 or NPUZ00211 (common naming). Inside, you should see an EBOOT.PBP file. The most famous of these projects is (and