Win8 system prompts "The previous USB device connected to this computer is not normal" What should I do?

Sometimes we connect the phone to the computer to do some operations, but after the phone is plugged into the computer, there is an unrecognizable USB device in the lower right corner of the desktop, working with the previous USB device connected to the computer. Not normal, Windows can't recognize it & rdquo; prompt, how to solve this?

Solution one:

1, right-click & ldquo; My Computer & rdquo ;, select & ldquo; management & rdquo; option;

2 click & ldquo; & rdquo ;, device Manager drop-down & ldquo; universal serial bus controllers & rdquo; option, find the & ldquo; unknown USB devices (description of the device identifier request failed) & rdquo ;, find the crux of the problem;

3, this problem may be related to the power USB, select & ldquo; usb root hub & rdquo ;, select & ldquo; power management & rdquo ;, as shown in FIG allowed power off;

solution two:

1, if the above method is more after the change can not start, then prove that the problem on the phone, you need to connect your phone to download software;

2, choose to use the wifi connection;

3, using a mobile phone to scan the two-dimensional code;

4, after scanning the phone, click on the & ldquo; immediately install & rdquo ;;

5, the phone number shown on the input to the computer, you can complete the connection;

the above is electrically connected to the phone to solve Way above message appears, and if you connect the computer to the phone appeared in the same prompt, you can try using the above method to solve. Finally, I hope this tutorial will help you.