To get Brawl onto your drive, you shouldn't just use a generic file splitter. You need software that understands the Wii file structure.
Plug your USB drive into the correct port on your Wii. Usually, this is the port closest to the outer edge of the console.
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First, open your command prompt or terminal in the folder containing your .wbfs file. Use the split command with a precise byte size for the 4GB boundary:
wit copy "Super Smash Bros Brawl [RSBE01].iso" --wbfs --split 4G-32K /path/to/usb/drive/wbfs super smash bros brawl wbfs split
Inside that folder, you will see a specific structure. The files will look like this:
For a visual walkthrough on setting up Wii Backup Manager for splitting large games like Smash Bros, watch this guide: 04:10 To get Brawl onto your drive, you shouldn't
Wii Backup Manager will detect that the file is over 4GB and automatically split it into .wbfs and .wbf1 files to fit the FAT32 format. 3. Verify File Structure