If you have a PC save file (Steam or retail version), conversion to PS2 format requires a HEX editor and is an advanced process. The general approach involves extracting the relevant hexadecimal lines from your own save and overwriting them in the downloaded save file. A community tool called "RE4 Save Reattribution Utility" attempts to automate this process for Steam saves, but results vary.
If your emulator closes unexpectedly during a save sequence, the virtual memory card may become corrupted.
Memory card corruption can occur through abrupt emulator shutdowns, storage failure, or improper edits. Mitigation:
If your savestate refuses to boot and crashes AetherSX2, your emulator settings or app version likely changed.
The utility allows you to import individual save files directly into a PS2 memory card image. This is particularly useful for merging downloaded saves with your existing progress.
AetherSX2 mimics the original PS2 hardware by creating (usually .ps2 or .mcd files). When you save your game at a typewriter in Resident Evil 4, the data is written to these digital files stored in your phone's internal storage. How to Locate Your Save Files