God Eater 2

[LunaMoo]

It tells you to download the updates while you put them to correct folder because they're encrypted with keys which ppsspp doesn't have hence they cannot be read by the game. The only solution is to decrypt all of those update files on psp or less officially at least find them already decrypted on the net.
With decrypted files and special ppsspp build it works just fine not counting other problems mentioned in this thread.