For Windows 7 network types, the secret lies in the GATEWAY entry. Any network you connect on that doesn’t have a DEFAULT GATEWAY provided with, becomes PUBLIC and you cannot change it’s type.
The solution is simple, specify the DEFAULT GATEWAY IP in the network properties and you are done.
There had been other suggestions like requesting the system to treat any future networks to be PRIVATE/WORK, but that will make a serious security issue if your computer is exposed in an environment that cannot really be trsuted, so, don’t do that.
Problem: Some of Huawei and ZTE modems are not compatible with WM8650 tablets.
Solutions: The solution is very simple, but clear: You must disable the flash drive dongle part.
This is most easily done by AT commands:
For Huawei modems:
Disable: at^u2diag=256 or at^u2diag=0
For ZTE modems:
The easiest way to AT commands on a PC you can issue the modem, you can use HyperTerminal or similar terminal program.
Thanks for the idea of the XDA community.