If you are using a fan-translated ISO, it usually retains the Japanese ID (NPJH-50618). If you downloaded a save file with a different ID, you can try renaming the folder, but this rarely works without hex-editing the save itself. DLC LBX Missing
: Ensure the save files from the previous games are in the standard PSP/SAVEDATA folder on your memory card before starting a new game. 3. Transferring Save Data to PS Vita
If you want, I can: