[Sephiroth]

When you get the SH working again, the notes below may be helpful.

The Apple Airport Express documentation is utter rubbish. There is nothing in there to help you avoid the inevitable gotchas - particularly the constant orange flashing light. So these are the key points to note:

1/
Ensure that the Express is in a default state if you screw up anywhere along the procedure. There is a pinhole reset for this purpose.

2/
Connect the Express by Ethernet to your Superhub and plug the Express into the mains.

3/
Invoke the Airport Utility on your PC and you should see the Express device present.

4/
In the Express Base Station page, tick "Allow setup over WAN". Otherwise you'll get an error message telling you to do this.

5/
You may notice the still orange flashing light on the Express device. If so, go to the Express status page and click on the orange light. You will find two problems, one of which will be double NATting. The advice offered is to put the Express into BRIDGE MODE. When you've done that and clicked Update, you will have knocked out both errors and the Express light will have turned green.

You're ready to use it for both 5 GHz & 2.4 GHz operation. The Express default state is to make the Express an extension of your Extreme network.

Hope that helps.