Hello, you first go to my computer - properties - hardware - device manager in the disk drive there is no question mark, if there is a question mark, you need to install the vivo cell phone driver before you can successfully connect. The driver download address is: /download/app_download.php?do=dn&type=&id=251If the exclamation mark is displayed, the driver is installed, but not recognized, you can right-click on the exclamation mark, choose to automatically update the driver and then try to reconnect.