Changing Camcorder's settings

[Secruoser]

Need help from you guys on this.

Basically Camcorder has a Secret Mode where the camera will continue recording video while displaying a fake lockscreen that looks like this (it actually shows the time but this is the image file (not screenshot):
lockScreenBG@2x.jpg

I used iPhone Explorer and replaced the image file with a black image, and the outcome is this:
IMG_0431.jpg

Need pros here to teach me how to remove the time and lock slider display on that screen. Which file should I modify in Camcorder's folder?

I'd like to achieve the result of only displaying the black image without showing the time, lock slider and anything at all. Thanks.