DSTwo not saving GBA games???

Hi all! I just bought a dstwo flashcart and it is not saving the progress on my GBA games when I save in game. Currently I have been testing harry potter and the sorcerer's stone. However, it does not save my progress. I installed the DSTwo firmware, update file, and GBA emulator. Please help!!!
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are you using the official gba emulator from the DSTwo website?