Cannot configure my AirPort Express (1st generation) anymore. Am using AirPort Utility 5.4.2 Setup Assistant. What do I do wrong?

I cannot configure my AirPort Express (1st generation) as base Station anymore. I had to reset it because I lost my password.

I first tried my IPads (IOS 6). These returned the message: Your AirPort Express cannot be configured with this software. Go to apple.com/nl/support/airport for more information.

As it is an old one, I have downloaded the eldest available AirPort Utility I could find on the Apple site (AirPort utility 5.4.2) to my computer. I ran the AirPort Setup Assistant wireless and the assistant found my AirPort named " Apple Network XXXXX". (I notes that the Assistant also returned the message: If this is not the AirPort Extreme you want to set up ...)

I clicked <NEXT>

After trying to connect to Network, I received the message: Cannot connect to network or there are no AirPort base stations on the network.

To be sure I retried running the Assistant after connecting the computer and the AirPort using an ethernet cable. The error message was the same.

What do I do wrong?

Am I using the wrong Utility software? If so, which version do I have to download and from where?

Is a first generation AirPort anyhow compatible wth 4the generation IPads or shoud I just buy a new AirPort.

I hope someone can help me...