It should have. Go to your nearest Device Support Center (ask at your nearest AT&T store where the nearest DSC center is - it could even be in that store) and ask them if there's a 4.4.4 update to the S5 and, if there is, could they please do it for you, since you haven't gotten one over he air. (It's safer that way too - OTA updates frequently fail, leaving the phone with problems.)