The Win7 system does not recognize the three solutions of the "unknown Device" driver.

The Win7 system does not recognize the three solutions of the "unknown Device" driver.

Specific steps:

Right click on 'Computer", click “properties", then click <;Device Manager>;

2. In Device Manager, expand “Universal Serial Bus Controller & rdquo;, right click on the "USB2 Enhanced" item, click & ldquo; disable & rdquo;, after deactivation can generally identify the "unknown Device" drive.

Method 2: The cause of this phenomenon may be that the USB cable is not good.

Solution: Use the original USB cable or use a USB cable with a shield ring (the length does not exceed 2 meters)

Method 3: The usb driver is too old to cause incompatibility

Solution: Download the USB controller driver from the corresponding brand motherboard officially, use 360 ​​driver master or driver wizard to intelligently Update the installation.