In the process of using the computer to transfer files, we sometimes encounter the problem that USB driver can't recognize after inserting USB disk, mobile hard disk, mouse or keyboard of u port, which results in the device can't work normally. So, when there is such an unrecognized situation, what should we do? Next, we will provide you with several common solutions.
The first solution, first click start, then right-click 'my computer', select manage, and select device manager in the pop-up window. Double click the "universal serial bus controller" item again, and then uninstall all the gray items and USB mass storage devices below. Then right-click the "universal serial bus controller" item and select "scan to check the hardware changes" in the pop-up drop-down menu. Finally, unplug the USB device and plug it in again to see if it can be recognized.
The second scheme is to refer to the steps mentioned above, find the "universal serial bus controller" and open it, then find the "USB root hub" project, and right-click to open the attribute. Switch the open properties window to the 'power management' tab, remove 'allow computer to shut down this device to save power', and click the 'OK' button (modify the properties of each USB root hub in turn). After the device is finished, restart the computer to try. If not, we can uninstall the USB root hub. Reboot again after uninstallation. Then unplug and plug in the USB device again to see if it is OK.
The third scheme is to first click the start menu, click the run command, enter the regedit command in the open box, and then click the OK button. In the pop-up registry editor, follow the previous path to open one by one. Then delete the 'UpperFilters' and' lowerfilters' keys in the right window, restart the computer after deletion, and then plug and unplug the USB device again to see if the USB unrecognized problem is solved.