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.
In the same fashion as the Facetime error it seems that iMessage is having a few issues of it’s own. Reports are coming in that when trying to use a new iPad and after activation, iMessage gives you the following error.