If the problem persists, please continue the next troubleshooting step. If the USB device is able to work normally, then the USB docking may be faulty or the power source of the docking (hub) is not enough. If you are using the USB device via a USB docking (USB hub), try connecting the USB device to the computer directly.We suggest you contact the device manufacturer. If the USB device is still not detected and not working well either, then the USB device may be faulty. If you have another computer available, try connecting the USB device to it.We suggest you visit ASUS customer service center for further tests. You may experience problems like USB device stops working or works intermittently etc. It may occur some USB performance problems. Check if there is any type of damage caused on the USB cable or the USB ports on the computer.

Please make sure your computer has been followed the installation documentation from the USB device manufacturer. that the USB devices software and drivers should be installed before connecting the USB device to the computer.

Some USB devices, such as printers and scanners etc.

Use Restore Point to restore the system.

Reinstall USB Host Controller driver in Device Manager.

Reinstall USB Root Hub driver in Device Manager.Update and confirm BIOS / Windows packages / drivers with the latest version on your PC.

Please refer to the following troubleshooting steps. If you experience USB (Universal Serial Bus) connection problems, such as hubs, flash drive, and printers etc.

Asus usb bt400 not working