https://oldcat.me/web/NOOTA9.mobileconfig
Click that link from your Device

FYI: If you ever want to remove it, remove it from your certifications.
EDIT: Just in case you don't know what this does: This installs the tvOS (Apple TV 4) program which makes the Device check for a tvOS update for your device, obviously this will never happen so it just displays as no updates available. You can easily remove this in case you want to update. This certificate is from Apple so there will be NO harm to your device, good luck