Make sure you have installed drivers. Change the flasher usb cable.
You have configured wrong ssid or password. WiFi running in 5Ghz only or unsupported wifi Authentication type, access your router settings and disable WPA2 EAP.
Connect device to computer take a note of Indentity number login using superadmin | indentity #
USB cable might be in bad condition try to change refresh the page and try again.
USB cable might be in bad condition try to change refresh the page and try again.