Download .ps2 memory card saves from sites like The Iso Zone or GameFAQs . Place file in memcards/ and boot game.
If you find a "God of War 1 save file" on Nexus Mods or Reddit that is a folder containing BISLPM-12345 files: god of war 1 save data aethersx2
Android 11+ restricts file access. Ensure AetherSX2 has "Manage All Files" permission enabled in your phone settings. Otherwise, the emulator reads the save file but cannot modify it. Download