Technical fidelity and graphical/compatibility notes Running RE4 under AetherSX2 on modern mobile hardware can yield better-than-PS2 visuals if configured properly: widescreen scaling, texture filtering, and higher internal rendering resolutions are possible. Save data itself is unaffected by graphical tweaks, but the overall comfort of seeing the game at higher fidelity while resuming exact in-progress states is delightful. A few minor issues sometimes crop up: occasional incompatibilities with certain cheat patches or unofficial mods can break save compatibility; mismatched region ROMs and save files may also cause errors. Stick to matched files (same region/version) to avoid headaches.