I have an ASUS RT-N65U using a custom firmware (188.8.131.52-075) from https://code.google.com/p/rt-n56u/downloads/list
So I can change SSID options for 2.5GHZ and 5GHZ but I can't connect to the 5GHZ variant. In my Mac says connection timeout. On my iPhone it immediately shows "can't connect".
I'm next to the router, because I'm testing so I don't know what else to do. I can change MTU, Channels, etc... Any suggestions?