Q: Is Uncharted 4 available on PSP? A: No, Uncharted 4 was not officially released on PSP.
Since there is no PSP version, you can only play Uncharted 4 portably through modern technology: i--- Uncharted 4 Psp Iso File Download
To save you time: While there are many websites and videos claiming to offer an "Uncharted 4 PSP ISO," these are always fake or modified versions of other games. Uncharted 4: A Thief's End Q: Is Uncharted 4 available on PSP