Even with the correct "Call of Duty Modern Warfare PSP ISO," you may encounter problems.
| Issue | Probable Cause | Solution |
| :--- | :--- | :--- |
| Game freezes on black screen | Corrupt ISO or bad dump | Re-download the ISO from a different source. Verify the file size (~1.2GB). |
| No sound during cutscenes | Emulator audio settings | In PPSSPP, go to Audio → Enable "Audio Sync" and "Atrac3+ decoding via SonicStage." |
| Poor performance / slowdown | PSP CPU speed too low | In PPSSPP → Settings → System → "Change CPU Clock" to 100 (Max). On real PSP, use CFW to overclock to 333Mhz. |
| "Game could not be started" (80020148) | Bad CFW ISO driver | On PSP, press Select → ISO MODE → Change from "Inferno" to "Sony NP9660." |
| Multiplayer not working | Ad-hoc party requires real hardware | Emulators have limited ad-hoc support. Use a real PSP or PPSSPP's "Ad-hoc Server" feature (beta). |
This is the best way to play at 1080p.
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