A few days ago a small series found the problem very confusing, WiFi connection always shows "unable to join the WiFi network" XXX "," On the Mac, then use the built-in wireless diagnosis function is found to conflict occurs because the country code. Here are adding country code without changing router settings for the US of WiFi.
Solution
1. Download Wifi master key
2. Find the wifi to be connected via wifi master key
3. Enter the wifi password, the connection is successful
These are the small series brings MacOS Tutorial - failed to join a WiFi network "XXX" solution to it, you learn it? More Mac software https://www.macdown.com welcome your visit!