It look like your device is not similar to the dual sim 3g GT-I9192 serranodsdd,
but a LTE verizon variant, codename serranoltevzw,
it could be unsupported by the serranoltexx unified build codename, as serranoltexx is designed for 8GB only internal storage, it is not the same as your’s
Edit : from /e/build metadata :
serranoltexx = serranolte + serranoltebmc + serranoltektt