This occurs because modern Windows editions require all drivers to be digitally signed by a trusted authority. Legacy Huawei drivers may trigger this alert.
Click Browse and navigate to the directory where you extracted your Huawei USB drivers (e.g., C:\Huawei_Tools\Drivers\BBU3900_USB\ ). bbu3900 usb driver
: Transferring and installing new software packages via a direct connection if remote access is unavailable. Local Maintenance This occurs because modern Windows editions require all
This usually means the driver didn't bind correctly. Right-click the unknown device in Device Manager, select "Update Driver," and manually point to the folder containing the .inf files. select "Update Driver
You must temporarily disable Driver Signature Enforcement.
Turn on the BBU3900. Plug the USB cable into the UMPT board's USB port and connect the other end to your laptop.