The images are for outdated version as mentioned by JPMontero to you in Galileo not detected after booting from Yocto image.
Try changing the image.
If you have a smartphone try to set up a hub and check if it connects fine?
If the problem persists,
can you post your wpa_supplicant.conf file (with the credentials blurred out ofcourse).
Also, did you follow the steps EXACTLY? Try copying pasting them again in the exact same order and check. Its best if you use a wifi hotspot from your phone using WPA-2 only.