I wanted to share what I found out.

 

I have been discussing with Kenwood suport these past few days on how to customize the start-up screen.

 

Here's what you should do:

1. Connect USB that contains your custom background ( for my test, i used an image with 480 x 234 pixels)

2. enter setup mode by:

- holding both SRC+EJECT and while holding it press the RESET button

- wait for the screen that displays:

- Kenwood Image

- OEM image

3. Select OEM Image

4. Select the file that you wanted to be the start-up screen, hit ENTER

5. You will be back to the screen described in (2)

6. Turn OFF unit by holding SRC

7. Turn ON unit by pressing SRC

 

The unit should start up with your customized background.