I've recently downgraded a friend's PSP using a pandora battery and installed 3.40 OE on it. She told me she was played Tekken on UMD (not on memory stick) when an error appeared. She exited the game by pressing home and when she started the game again the message "the game could not be started (80020148)" appeared. Now she can play all her UMDs except the Tekken one. Does anyone know what's wrong or how to fix it?