If you need to backup your save file or transfer it, you need to know where AetherSX2 stores the virtual Memory Card (MCD001.ps2).
If Resident Evil 4 says "Memory Card Not Found" or "Data Corrupted": save data resident evil 4 aethersx2
Download . Extract your save from Mcd001.ps2 using myMC , edit the values (set "Handcannon" to owned, set "Mercenaries Stars" to 5 per character), then inject it back. If you need to backup your save file
You are looking for a file usually ending in .ps2 or .cbs (if it is a compressed format). The standard raw file is Mcd001.ps2 . save data resident evil 4 aethersx2