m having dead pixels on note8 screen.. some of the screen remain yellowish eve when rest of the disply is pure white n some times disply not response on some particular areas when touched its like a deadzone happens for few seconds

yesterday update notification popped up on my s8 plus but i was busy so i pressed later, but today i wanted to update so i went into setting software update n its saying "latest version already installed" but my device is still 7.0.. update isn't sho...