If you want to customize the boot screen on the 878, it’s quite simple to do with your favorite image editor.
- Create an image that is 160×128 pixels
- Save/Export it as a bitmap (.bmp) file
- Within the CPS software, select your COM port by clicking Set | Set COM
- Click Tool | Boot Image
- Click Open Image and select your file
- Click Write
That’s it. Here is the basic boot image that I created for my D878UV: