I have Dell Inspiron 3542 already have BIOS A12 latest. I am currently using latest driver 1705 wireless 802.11 too. Before doing update to 1709 (Windows 10 Fall Creator Update) I had no complain at all. My wireless WiFi worked very fine. But after update to 1709 this wireless WiFi, Airplan Mode, and Mobile Hotspot stop working completely. I reattempted to reset and reinstall Network, as well as uninstalling the driver and then reinstalled them back on, but come to no avail . I even tried the other driver Dell Wireless 104.1078 driver but had no hope.
Now I am using cable to hook up internet while waitng for either DELL make a new driver update or Microsoft itself fix this problem.