Mango and wep wifi extender

Hi all!

I just received a mt300N v2. I want to extend my existing wep network. I know it’s out of date but in my country side house it’s like that.

The router can’t detect my existing network. Only others. So i guess it has to do with wep encryption ?

Chat support on facebook told me it was compatible but i don’t think so as it can detect other network that are wpa enceypted but not mine that is wep encrypted.

Can someone show me a way to make it work?

Best regards.