Default After unroot cannot update firmware

Hello first time posting sorry if i make mistake. So after long time i've root my note2. i decided to unroot to upgrade my firmware. so after i use triangle and use SU to full unroot. i've check the status.
status custom binary download : no
current binary:Samsung official
system status : official

after that i tried to update firmware via wifi. but its only loading and nothing happened. so i tried via kies. and after download all files 100%. and enter update progress. it stuck 0% and nothing happened. i decided to turn off the phone. and it still doesnt update. can anyone help me how to update the firm ware. thanks guys.