Wireless devices cannot be connected in the AP mode.

Try taking the following measures, in this order:
-Properly select this unit’s SSID on the wireless device.
(On this unit, UTILITY -> WLAN INFORMATION -> SSID)
-Properly input this unit’s password on the wireless device.
(On this unit, UTILITY -> WLAN INFORMATION -> PASSWORD)
-Change the wireless channel and reconnect.
(On this unit, UTILITY -> WLAN SETTING -> OTHERS -> CHANNEL No.)
-Turn the power of this unit and the wireless device off then back on, then reconnect.