Dear PMDG teamDo I have deleete the saved old (before instalation 400F) cold & dark situations of the 400 PAX or not? Does an saved old cold & dark situation of the 400 PAX start with the latest updates with the instalation of the 400F?I hope you understand my questions. English ist not my mother tongue.Thanks and best regardsMarcel

Marcel-We haven't really tested- to be honest.From what I know about the airplanes- I think they are probably "mostly" compatible- although you might wind up with some odd system setups in the fuel system/ECS controls and a few other places...It might not work at all- we really didn't try it. :-)