Use the Huawei Mode Switcher utility (available on GitHub or XDA Developers). This tool sends a command to switch the device from “HiLink” or “CD-ROM” mode to “modem mode”.
Uninstall any old "Huawei Mobile Partner" software. Then, let Windows Update find "Remote NDIS based Internet Sharing Device." huawei e5573cs-322 drivers
In these cases, the drivers allow your computer to communicate with the device via RNDIS (Remote Network Driver Interface Specification) or CDC Ethernet. Use the Huawei Mode Switcher utility (available on