Make sure your SD card is 32GB or smaller and strictly formatted to FAT32 . The original Wii menu cannot consistently read exFAT or massive SDXC cards without homebrew assistance.
This happens when there is a mismatch between the game version and the save file version. Ensure your ISO/Disc region matches the save file. Sengoku Basara 3 Utage was exclusively released in Japan, so it requires an NTSC-J formatted save file. If you are using an English fan-translation patch, it usually retains the NTSC-J save structure, but check the patch notes to confirm. save data tamat basara 3 utage wii new