  We analyse the topological transition and localization evolution of
disordered two dimensional systems with non trivial topology based on bipartite
lattices. Chern insulators with broken time reversal symmetry show non standard
behavior for disorder realizations selectively distributed on only one of the
sublattices. The Chern number survives to a much stronger disorder strength
(one order of magnitude higher) than in the equally distributed disordered case
and the final state in the strongly disordered case is metallic.
