You might find websites ranking for this search term. They will promise a "cracked ISO," "ready-to-play ROM," or "PSP emulator version." These are 99.9% scams or malware. Here is what actually happens when you click those links:
Uncharted 4: A Thief's End was never officially released for the PlayStation Portable (PSP) . It was developed exclusively for the PlayStation 4 and later remastered for the PlayStation 5 Windows PC i uncharted 4 psp iso file download top
If you’re interested in of classic PS1/PSP titles, let me know and I can explain how to dump your own discs/UMDs. Otherwise, I’d recommend avoiding shady “PSP ISO” sites for modern games — they’re almost always dangerous or fake. You might find websites ranking for this search term