Brightness glitch/hack xbox 360

So a long while ago probably like 6 months to a year my little brother decides to get in a modded lobby for whatever and he ended up getting the brightness crazy high and even turning it all the way down its still way to bright...

Since mw3 is coming out in like a month figured I would play a little mw2 but then found out brightness is jacked and I can't find any information on how to fix it.

Can anyone help me get this problem solved please?

Its only for mw2. Other games are fine. Its also not the tv settings. It has to do with getting in a modded lobby which intentionally hacks the persons brightness. My little brother thought it was a prestige lobby he said or something, but instead it reset his prestige and changed the brightness to crazy bright lol.

Ill give 240 microsoft points to whoever tells me how to fix (all i got and im not buying more)

Thanks moto only problem im having is one of the required programs usb xtaf will not open device I hit it and it does nothing...

Tried that as well. The problem is xbox patched the way in the video of making a modded gamertag or w/e when i make it and try to import the tag to xbox it says corrupted gamertag... So does anyone know another way to make a gamertag like that? That xbox hasnt patched/fixed?