You could try using the disk.
dude, he says his brawl doesn't work anymore, or in other words, the disc might be broken ¬¬
I've had my Brawl for awhile, and because its been through alot(my bro gets mad if i beat him enough.... And im relaly good) so now its stopped working aswell and some character wont load. I have a backup on my USB which is used for the USB loader but when i play it, it doesn't load after the loading screen. Should i use another means of loading the game or fix the USB loader. whats the problem?
and maybe you're using the wrong IOS(yes IOS, not ISO) or your ISO(yes now it is ISO) is corrupted, you could download another one, or back one up from a friend or something and try it with that one.