Most save files found on databases like GameFAQs are in specific formats that Android emulators cannot use directly. You must use a builder/converter to inject these saves into a virtual memory card file ( .ps2 or .mcd ) that the Android app can "mount". How to Use PS2 Save Data on Android
save files on Android is essential for players using emulators like or NetherSX2 . While the original PS2 Save Builder is a classic Windows utility, its functionality is central to preparing and converting save formats (like .max , .cbs , or .xps ) so they can be recognized by mobile emulators. What is PS2 Save Builder?
: Create custom save folders that a real PS2 memory card (via uLaunchELF) or an emulator can read. Why You Need It for Android Emulation
Comprehensive Guide to PS2 Save Builder for Android PlayStation 2