Run MGSFIX to temporarily downgrade to D2 first on your PSP, complete the first mission on Peace Walker (Not the tutorial, the first proper mission) then your safe to run MGSNEVER and go back to D3 and continue playing. Enjoy!
Ah, yes, portrait mode, surely the best way to film a row of people. If only there were some way to fit a wider shot, at the expense of height... if only...