Real problem after changing a setting (please read!!!)

Hi all,

This is the situation:

A UBEE wifi modem from my cable provider.

On the Ubee i connected my Airport Extreme Base Station (AEBS) via UTP, and have set it to bridge mode.

On the AEBS I have an Airport Express connected (via UTP) to extend my WiFi coverage.

For the last few months this worked like a charm.

Today I changed the setting on my Express not to create a network (a default setting), but to extend the network from my AEBS (the AEBS was always creating a network).

And now, both my AEBS and Express can not be found anymore, resulting in no network and no internet.

I disconnected the Express, but still the AEBS can't be found.

I did a factory reset on the AEBS, but again, the AEBS can not be found.

The problem is that I cannot connect the AEBS directly to the internet because of the UBEE wifi modem wich has default settings (meaning I didn't change them), and the AEBS must be used in Bridge mode to function properly.

Please can someone please help me to get everything work again.

I have both version 6 and 5.6 of Airport Utility.