First of all, we should know that 64-bit win7 restricts the installation of drivers without authentication signature in consideration of system security. So the solution is actually very simple. Just turn off the digital sign of win7 driver, and Qualcomm 9008 driver is the Qualcomm 9008 port driver (Qualcomm 9008 mode driver) provided by Qualcomm, which is very easy to use in Qualcomm ... The system image and software released by Win7 System House come from the Internet, and are only for learning and research, and should not be used for any software root. Sometimes the computer operation defaults to the root directory (/root), and other users have no permission.