The update wasnt for it to be brighter. It was for when you turned brightness all the way down and contrast all the way up on reverse camera screen it blacked it out.
I'm confused the wheels on the yellow one is flat or diamond? Because it looks matte color in the picture. But the comment you made says diamond black on stock tires. But when you scroll above a sponsor posted pictures of the diamond black and its shiny and glossy.
Agreed if you're going to look for problems you're going to find problems. If no engine lights are going on then temp is fine it's performing within its parameters. If the car still starts battery is still good. If it died every other week than ya theres an issue.