T-mobile lg stylo h631 imei repair fail

Hi, trying to repair imei of LG Stylo from t mobile. the model number is h631.
But It is not working. It is asking me to root the phone but there is no root out for 6.0. I am not sure what to do if someone knows what to do or the OCTOPUS/OCTOPLUS team could help too that would be great! Thanks 😀