Fire Emblem Three Houses -010055d009f78000- -1.... -

Even with the -1.... error, you may still recover:

If the main story save is lost, use New Game+ to restore: Fire Emblem Three Houses -010055D009F78000- -1....

Emulators store saves in: /bis/user/save/0000000000000000/010055D009F78000/ Even with the -1

If you drag a save into the wrong format or region mismatch, the emulator logs -1 as a read error. If the main story save is lost, use New Game+ to restore:

Before any editing, copy the entire 010055D009F78000 folder to your PC. Corrupted saves cannot be recovered easily.