Tip: type in the car vehicle name and end the search with Render example " Ford Black F150 Render"
2. Resize the Photo to 1366x733 pixels
3. Convert the Image or Be sure the image is PNG file type
4. Name the image zxwlogo.png
5. Place the image in File Manager - Flash
If you like to play music you can use a player from the Play Store called Misciolet. It can play and also display cover art images on the screen. You can also use VLC video player to change the song photo art to whatever you want.
Also, about the boot up image. You can't change the boot image on a new PX6 MCU version RL78c because the built in boot changer software will not work.