You are loading the game state (Save State) rather than the memory card data. Solution: Do not use "Load State" from a previous session. Restart the game using "Boot DVD" and load from the in-game menu.
Action Replay or CodeBreaker formats. These require conversion before AetherSX2 can read them.
Navigate to your device's Download folder and select the downloaded .ps2 file.
Visit an online save converter tool or use a desktop program like . Import your .max or .cbs file into the utility.
This guide explains how to find, download, and install a 100% save data file for Ultraman Fighting Evolution 3 on AetherSX2. What is AetherSX2 Save Data?
: If you're looking to edit the save data (e.g., to unlock characters, levels, etc.), you might need a hex editor or a specific tool designed for manipulating game save data.
Ultraman Fighting Evolution 3 - UNLOCK EVERYTHING Save Data (AetherSX2)