Hope this might be helpful to some. I changed the home page logo for my PX6 unit on my Lexus GX470. When I first got the unit,
it appeared to have a Ford Focus or something as the vehicle. See below.
When I tried to replace it, it suddenly changed to Lexus GX470 logo.
Hmmm I thought I must have the png file parameters incorrect.
I played with the image settings and now have a different logo.
To do this, I replaced the zxwlogo.png with my logo with the same name. It is in the root drive of the FLASH directory in the File Manager.
I attached the logo here in case anyone would like to use it