I had set up my galaxy note 4 with the fingerprint lock screen a few weeks ago and it was working perfectly until it suddenly dissapeared and all I'm left with now is a black lock screen and it's asking for a password or backup code, which I have no idea what it is after trying so many possibilities. A message will come up saying 'unable to verify your finger print 5 times. Try again in 30 seconds.' It didn't even have the finger print scanner there for me to verify anyway! and now I can not get into my phone at all. any one else experience this or have any suggestions?