Reason: The default multi-mode settings on your router work for most Wi-Fi clients, however, some older devices require that you set one of the Wi-Fi bands to support older BGN standards.
Solution: Set your 2.4 GHz band to 802.11 bgn:
Reason: The default network security settings on your router work for most Wi-Fi clients, however, some older devices may not have access.
Solution: Contact your service provider for assistance. If you are entering the correct password and still unable to connect, change the network security setting to WPA/WPA2 Mixed Mode:
Reason: Some Wi-Fi devices cannot properly store special characters or long passwords.
Solution: Change your Wi-Fi password.
Reason: In rare cases, a Wi-Fi device may have issues with the same SSID being used on both 5GHz and 2.4 GHz bands.
Solution: Disable the 5 GHz band.