To fit the hardware limitations of the PSP, some compromises were made compared to the home console versions:
The USAFixISO is because some older versions (v1.0–v1.4) had minor audio sync issues with the clean ISO. The Fix corrects that, though recent PPSSPP builds (v1.15+) handle the original ISO fine. tekken 6 usafixiso psp
If you are looking for this on modern consoles, a converted version of the PSP title is available directly on the PlayStation Store for PS4 and PS5. To fit the hardware limitations of the PSP,