Modern Huawei USB LTE modems can be used in two very different modes. I have also included latest Stick-mode firmware 21.200.07.00.805 I've found and corrected some incorrect information on original post.
I purchased additional modem that's externally identical to old one but had different serial port USB ID (USB\VID_12D1&PID_1442&MI_00) missing from earlier driver pack causing original instructions to fail. This is updated version of my original post.
