If all else fails, the WBFS header might have a corrupted game ID. Mario Party 8’s region flag can be miswritten.
I actually used GUIFormat to format my drive to FAT32, 32k cluster size per recommendation. I tend to recommend GUIFormat as well,
: Place the game in [Drive Root]:/wbfs/Mario Party 8 [RM8E01]/RM8E01.wbfs .
Older WBFS dumps often have missing video partition headers specific to MP8’s FMVs.
Before modifying the file, try these specific settings within your USB Loader (USB Loader GX, WiiFlow, or Configurable USB Loader): Set this to 249 (base 56) or 250 (base 57).
Ensure the file ID is RMCE01 . If it is labeled differently, the loader may apply the wrong patches. 3. Custom IOS (cIOS) Update