TANGENT QUATTRO doesn't keep the Edited Key when switched off

[joseoscar]

I put the key to my Router and I listen OK.

But then, when I switch on the Tangent Quattro again I see on the screen the name on the old Router, and immediately sends me to other routers.

When finally I've found on the screen my new Router, it asks me again Edit the key.

So it works on the moment I Edit the key, but doesn't memorize it.

 

Both routeres (old and new) are: AR-5387un wireless ADSL2 + Router

 

I've got two TANGENT QUATTRO

 

I appreciate your help