Apologies if this has already been covered but I thought I would share....
Figured out how to update the startup image when you turn on the car.
If you get a USB memory stick and create a folder called "startupimage" and then place 3 JPG images in it will allow you to upload to the car.
I've only attempted so far with JPG format at 640*480 and it fit perfectly.
it does not replace the 4th image (which is the stock load image) and they can be replaced by simply repeating the above with new images.

Figured out how to update the startup image when you turn on the car.
If you get a USB memory stick and create a folder called "startupimage" and then place 3 JPG images in it will allow you to upload to the car.
I've only attempted so far with JPG format at 640*480 and it fit perfectly.
it does not replace the 4th image (which is the stock load image) and they can be replaced by simply repeating the above with new images.