If your PC sees a "Huawei TF Card Storage" but no modem, the drivers haven't fully "hooked" into the system. Huawei E5372 Review - 4G MiFi Device - 3G.co.uk 24 Nov 2014 —
When you connect the device to your computer via USB, the system should automatically recognize it as a virtual CD drive. Driver Modem Huawei E5372s
For the most up-to-date software, use HUAWEI PC Manager or the official HUAWEI Support Portal to scan for hardware and update drivers . Quick Device Specifications Downloading Drivers | HUAWEI Support Global If your PC sees a "Huawei TF Card