Wiiscrubber step-by-step 1) Make sure you've downloaded Wiiscrubber 2) (Optional) back up your SSBB ISO before editing it 3) Open Wiiscrubber and load your ISO file 4) If you get the message "io_read" several times, hold enter until it stops and you eventually see the message "partition header" 5) If your ISO is the full version, there should be 2 sections like this: Partition 0 - UPDATE Partition 1 - DATA 6)Expand "DATA/Partition 1" and scroll down until you see the "fighter" folder, open "fighter" 7)Scott goes over Lucas, so keep scrolling down until you find Lucas' folder 8)Once his folder is open, replace each individual file by right-clicking, and selecting replace 9)After all of these are replaced, Scott should be in the game, however he will have no custom portraits or anything
To replace portraits and other in-game icons, you'll need to check another tutorial unfortunately unless someone else is willing to explain it in this topic as I don't have enough time
10)After you did everything needed, just click the x in the corner and hit yes
That's the only way that I'm really familiar with that works in ISO loaders. The only methods for loaders that I know about all involve modifying the ISO itself (like this); I don't think there's an ISO loader that will read custom files from an SD card either. I could explain Wiiscrubber if you need help with it.
From what info you've provided, you seem to be playing Brawl with an ISO loader, is that correct? If so, then you can't use Riivolution or Gecko to load custom files as they don't support ISO loaders. Instead, you will need to download WiiScrubber which is a special program for replacing/editing files in Wii games. Is this the case?
EDIT: @mareeo64 Sorry about any mixup but I was actually referring to sakamichi's situation
If you're using an ISO loader of any type, you must modify the ISO itself with WiiScrubber and replace the files manually. Make sure to make a backup of your unmodified ISO before editing any files in it.
If I remember correctly, the "sawnd.sawnd" file is a temp file (its not important), but if you're using an ISO, you just replace the "smashbros_sound.brsar" with yours.
A .sawnd file is a sound pack that is supposed to be used with sawndz http://forums.kc-mm.com/index.php?topic=22464.0 If you don't already have it, you will need to have a smashbros_sound.brsar. If you're using Gecko, you won't be able to use custom sounds however. What you do with the program is put smashbros_sound.brsar and your .sawnd file in the same folder as the program, hit "Insert .sawnd" and then choose your file. After it finishes, your custom sounds should work.
It looks to like the filesystem got screwed up. Did you remove if from any devices while in use? It probably wouldn't brick your Wii either, it would probably be displayed as "blank".