How to connect unknown usb device in virtualbox?

Question

Android

There is windows 8.1, there is a tablet on android 4.2.2
To flash a tablet on 4.4 of the manufacturer, you need to hold down vol + and plug in the usb cable, windows 8.1 stupidly writes an unknown descriptor error, windows 7 users everything turned out, the manufacturer gave the driver.
The situation is such that the hospital is alone at home and he is on win 8.1, now he has put win 7 in virtualbox, but he does not see how it is. As I understand it, it is necessary to allocate the usb port of virtualbox and prohibit win 8.1 from intercepting signals from it, and allow win 7 in virtualbox

Answer 1

I did so stuck the device, in the Wirth settings. machines in the usb section, check the box, pull out the device. We start the car, wait for the full load and then connect the device.