Answer to "Why do I have white dots on my screen when I enable HDR on a 4K HDR TV"If it's a cheap tv, there's your answer. Buy one that costs a good amount of money. It'll (probably) be higher quality.
Answer to "Can't update my device"You might want to check for a secure connection in the USB ports. The one for your GPS might have stopped working properly. Your computer might be messed up as well.