Select and configure the fields:
This is the most reliable method when Windows flags the connected BBU as an "Unknown Device."
If you get successful replies, your driver is functioning correctly, and your physical link is established. 5. Troubleshooting Common Issues
Official drivers are usually bundled with Huawei's local maintenance software or available through professional telecommunications portals. bbu3900 usb driver
Error 2: The device keeps connecting and disconnecting repeatedly
Field operations often happen in challenging environments where driver errors can delay deployments. Here are the most common issues and how to fix them:
Last updated: May 2026 – Verified for Windows 11 23H2 and BBU3900 V100R016. Select and configure the fields: This is the
If you are attempting to connect a PC to the BBU3900 for maintenance, the connection is usually established via a Fast Ethernet cable
Before diving into the driver, let’s establish a foundational understanding of the hardware.
Acquire the driver files securely from the Huawei Support Portal (Support-E) or from your project's technical documentation repository. The driver package typically contains files named hw_usb_mdm.inf , hw_usb_vcom.inf , or an automated executable installer like Setup.exe . Step 2: Disable Driver Signature Enforcement (If Required) Error 2: The device keeps connecting and disconnecting
Right-click on Setup.exe (or DriverInstaller.exe ) and choose .
Leave blank, or set to the BBU IP ( 192.168.0.49 ) if required by your software build. Click OK to save the settings.
A USB 3.0/2.0 to Ethernet adapter cable (often labeled for BBU3900/3910 debugging) AliExpress link.
Connect your laptop to the BBU3900 UMPT USB port using the cable and power on the BBU.