When the BBU3900 is connected, its USB descriptor reports:
Always download the driver directly from Huawei’s enterprise portal or an official LMT software bundle. Avoid generic USB-to-serial drivers unless you are absolutely certain of the underlying chipset. And remember: when the USB driver fails, fall back to the Ethernet maintenance port. bbu3900 usb driver
The standard driver used for local commissioning and management is the HUAWEI Wireless HS-USB Ethernet Adapter : 1.03.00.00 or later is commonly used. Operating Systems : Compatible with Windows 10, 8.1, 7, Vista, and XP (both 32 and 64-bit). When the BBU3900 is connected, its USB descriptor
Follow this procedure carefully. Admin rights are required. When the BBU3900 is connected