Need help unlocking ZTE Z740, Z755, Z833, Z992, and more…

I need to unlock the following ZTE phones:
Z730
Z740
Z755
Z812
Z828
Z833
Z990
Z992

I am currently running QCOM Smart Tool v1.0.0.10970. When I chose a port, select "Unlock" and press "Do Job", it searched for the phone and returned nothing. It looks like I need to install drivers for the phone so the tool can connect to it. What driver file(s) do I need to download and install for those phones? Thanks in advance for your help.

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