there are an estimate of 130,000  GM VINS available at the moment  on autel server many more will be added soon  this is for ECM,TCM,ABS for BCM and the rest of the modules  will also be added later as well  if you run into this message vin not supported  report your vin number here on the site and   it will get added to the list  for those of you who never flash/program a module there are some instructions here on the maxisys section some where read them it may come in  handy for some one  have a save flashing experience  good day to all of you.