“ Originally Posted by GokuSS3 
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You would have to resize the image to 480 by 640 , then once you do that you must rename the file "wallpaper". Make sure when you resize and save the image an it is .JPG other wise it wont change in s2u2. Also one you do this soft reset an it will take effect. Oh and this has been stated a few times in the site so search next time.
His profile says he has a mogul which is qvga, so IF thats true, he'd have to resize for qvga 240x320 as opposed to 480x640