: Converts the proprietary BBU communication protocol to a standard Ethernet IPv4/IPv6 stream over USB.
Follow this procedure carefully to install the BBU3900 USB driver correctly. bbu3900 usb driver
| Issue | Probable Cause | Solution | | :--- | :--- | :--- | | | Driver signature enforcement or cable fault. | 1. Try a different USB cable.2. Disable Driver Signature Enforcement in Windows Advanced Startup options. | | Driver Not Found | Missing driver files. | Download the specific driver pack for the Main Processing Board (e.g., UMPT) from the Huawei Support website. | | Garbled Text on Terminal | Baud rate mismatch. | Cycle through common baud rates (9600, 19200, 38400, 57600, 115200) in terminal settings. | | COM Port Access Denied | Port in use by another application. | Close other terminal sessions or software (like synchronization tools) that might be occupying the port. | : Converts the proprietary BBU communication protocol to
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