Immobiliser renault Scenic

Hello guys, have Prolem with my Megane Scenic (JA0F) build.-Year 1999). After car battery change (with the strong negatives of the last weeks broken together) the car can no longer start. With radio key opened, key in the ignition lock turned around motor does not start. It flashes the red lamp (WFS), when starting it does not go out and blinks clearly faster, starter spins perfectly through (new battery), moter makes no muck. with both keys probi ert. Expert workshop with Renault experience is helpless. Does any of you know a solution to this problem. Thank you very much in advance. Greetings guennigology