If you have a DS Phat with v4 firmware, then you can use FlashMe to enable light adjustment on DS. If you have an earlier DS Phat, it will still not work. To check what firmware your DS has, go to PictoChat with a DS game inserted, enter room A and remove the game card. (Dont worry, its safe as the DS Card is not being accessed at the time). If you have v4, both screens will go "golden yellow". If PictoChat freezes, or both screens go either blue or dark green, you have an earlier firmware, and cannot get the ability to adjust the brightness.