Hi, RX and tx has something to do with transmitting and receiving,the TX pin sends out
the signal and RX pin receives the signal . status one, uploading error.
...your kia could be build in Korea best solution is having the keys made by the kia
dealer or certified locksmith.

Hi, yes it should, have you tried this,choose kia ,search 2011 optima, choose the hot
function,than choose diagnosis, than you see the option key fob or smart key to
choose from,than follow the on screen information.