Some firmware files may require a flash code, which can be generated using a Huawei Flash Code Calculator . Cannot Flash Huawei E5573s-856 modem - Hovatek
Once the loader is successfully pushed, use a separate tool like balongflash to install the actual firmware. Critical Warnings and Risks balong-usb-downloader-1.0.1.10
Select the correct COM port identified in your Device Manager. Select your usbloader.bin file. Click to transfer the loader to the device. Some firmware files may require a flash code,