Hi homer,
in order to load the application onto a newer OP you need the original Protool application file.
It is not possible by uplading from the panel and then loading onto a panel of different type.
In Protool, the application has to be "converted" to the other panel.
By the way, do not get an OP27, it has been discontinued as well. You should select an OP270-6, this is the latest model that resembles the OP25 the most.