lg k550 stylo 2 plus how to unlock lg tool z3x box

hello, I have a problem, when trying to make the unlock to this model I jump the error of not supported, and this root, I have credits (I already have 10 credits and I do not know if that is why) and I will buy more, but I require your help to carry out the process with the z3x box

active samsung tool pro
active lg

please any suggestions!