Hatsune Miku Project Diva 2nd

[LunaMoo]

^The game should bypass lack of the install data(which isn't properly supported as being useless), so it seems like a savedata issue ~ would probably have high chance to be fixed if you posted it in here.

As a quick fix you can go to install data menu on psp and delete it, then load and save the game without install data, which should probably work properly on ppsspp then. If you just care about unlocking full game on ppsspp you can use mine which I posted around here and then just edit your player profile, customize rooms etc..