Update to 3.03 OE-C, it's worth at least that much.
I actually just started a thread about this over in one of the other forums. Basically, get an XMB pack (wave pack, topmenu, whatever) and fire up Recovery Mode. Advanced Menu, Toggle USB Flash0.
MAKE SURE YOU BACK UP YOUR FLASH0 BEFORE DOING ANYTHING!
There's a guy over in the Homebrew Discussion forum who got all mad because we weren't all Johnny-on-the-spot to help him the instant he posted, with his bazillion threads, yet all his problems could have been prevented if he backed things up.
If you go to 3.10 OE-A', THERE IS NO WAY TO MAKE TOPMENU FUNCTION, SO DON'T TRY. You'll just semi-brick. Just a warning, to prevent a thousand questions about this.
Anyway, now you've mounted Flash0 on your computer. AND BACKED THINGS UP. So, just overwrite the files included in the pack. They're probably in vsh/resource, but make sure you check the readme before doing anything. Then that's all. Yep, that's all. Just overwrite the files. Then, unmount the flash (you Windows users call it "safely removing" a drive) and exit recovery mode.
If you hack your XMB waves, you may end up with a white screen. Just go over to the Theme settings and choose the first color. That ought to fix it.
You may not have enough space on your flash0 to do anything, though. Go get Flash Agent F4 (It's on http://dl.qj.net) and it has an option to remove the "dummy" files (if you're low when you run it the first time, it'll offer the option to "link dummy files" which essentially is the same thing). Then do your wavehacking.
Have fun man!
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