This was a gift a couple of years ago and all of a sudden after over 3 years when I try to log onto it, it's asking me for a securit key passcode. I have no idea what this might be. Where can I find it or change it. It was installed in 2016 and I don't remember using a code or creating one. Any help will be appreciated because without the securit key passcode, I cannot use this WiFi extender.