This has been driving me mad for the last few weeks. For some reason if you select 802.11n (5GHZ mode) and set the channel to be automatic you get the dreaded Invalid Radio Channel error message. It’s there in the drop down box so why on earth is it invalid? The solution is incredibly simple.

Continue reading → Fix: AirPort Express Invalid Radio Channel When Trying to Use 802.11n (5GHZ mode)