A community-verified fixed save file has been shared across forums (e.g., Reddit r/EmulationOnAndroid, GBAtemp, PCSX2 forums). This save file:
Even with the correct file, you must adjust these settings to avoid the “Data Load Fail” error: Ultraman Fighting Evolution 3 Save Data Aethersx2 Fixed
: Many users find that AetherSX2 doesn't auto-format new memory cards. To fix this, go to the emulator's side menu, select Load BIOS , and use the internal PS2 system menu to format the virtual card before attempting to save or import. A community-verified fixed save file has been shared