I have a 7730L that will tether off of USB when connected to my MacBook. When I try to use USB tethering on my Win10 workstation it doesn't work. This was prior to Win10 update 1809 and after updating to 1809.
It shows up in device manager under other devices, MiFi 7730L. It says no driver is installed and cannot fine one through the normal process. All the documentation on VZ says that no driver is required. There seems to be no trace of a driver that can be downloaded elsewhere.
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