  We discuss the linearization of a non-autonomous nonlinear partial difference
equation belonging to the Boll classification of quad-graph equations
consistent around the cube. We show that its Lax pair is fake. We present its
generalized symmetries which turn out to be non-autonomous and depending on an
arbitrary function of the dependent variables defined in two lattice points.
These generalized symmetries are differential difference equations which, in
some case, admit peculiar B\"acklund transformations.
