The installation process depends on your platform, but always involves placing the folder in the correct SAVEDATA directory. Save Data Path ms0:/PSP/SAVEDATA/ (via USB connection) PPSSPP (Windows) Documents\PSP\SAVEDATA\ PPSSPP (Android)
The game uses a 2D binary matrix:
For on the PSP, save data files typically allow you to skip the grind by providing 100% completion, massive amounts of cash, or unlocked "King" cars. Save Data Locations Nfs Pro Street Psp Save Data
