Greetings.
I am hoping someone can help me. I seem to be having the same problem as others have reported in this thread. I don't understand how it was resolved (if it was).
I just bought this router yesterday (7/6/2014). Installation and set-up went easily, as described/expected. I set up one SSID for the 2.4 GHz and a different one for the 5 GHz SSID. One big problem: none of my devices can see the 5GHz SSID and I cannot manually connect with any devices (with one exception). I have 2 Xbox 360s, an IPhone 4s (work), an LG VS9 4G (older personnel cell phone), and a Samsung Galaxy Note Pro 12.2 (the one exception - more about that in a minute).
I have the LED indicator solid blue, I seem to have the set-up correct (not hiding SSID, etc.). I contacted ASUS via web (email), an I received a response within a few hours. (Kudos to ASUS for that!) Instructed to change the Channel Bandwidth to 20 MHz for the 2.4 GHz and 40 MHz for the 5 GHz (which I did), and if that did not work (it did not), then do a hard reset - which I did. Reset things up. Still no luck.
About the one exception. At first the Samsung Note did not identify/connect with 5 GHz. At one point in the wee hours of the morning I managed to connect it. I honestly do not remember if the device "found" the SSID or if I just tried to set it up manually. In any event, this device now connects to the 5 GHz, even when I leave home and come back later - it picks it right up. This lone device remains connected, even after the hard reset and setting the router up again. I still cannot connect any other device. I am really interested in getting the Xbox's on this frequency....this is why I forked out the $$$$ for this router!
Can anyone help? I sent a follow-up message to ASUS tonight...but I am impatient and not confident I will get a solution any time soon. I really do not want to return this and start over.
Some of these devices (like iPhone 4s) simply do not support 5 GHz wifi. Same with most XBox 360s (I believe it depends on the revision).