Judging by the screen shots it looks like the chipset drivers are not installed. I would suggest installing them then try to install the adapter drivers which are available here.
I have an old Inspiron 3275 and I recently reinstalled windows 10, but the wireless adaptor from Qualcomm QCA9377 doesn't work, so the laptop has no WIFI connection. I tried to remove the existing driver and install a new driver from the dell website, but it still doesn't work. I also installed new BIOS from the dell website, but the laptop still has no wifi. Here are some screen shots. Can someone help me to find out the problem? Thanks![IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE]
qualcomm QCA9377 doesn't work after reinstalling windows 10 on dell laptop