Evolution of the generalized 2D instability window. All coloured points are MRI-unstable according to the standard MRI criterion, while only the blue ones are according to the updated criterion. We see that at 20ms the instability is potentially active only at small radii, 7 ≲ R ≲ 12km, and close to the equatorial plane. As time evolves, we observe that the region at larger radii, but still close to the equatorial plane, also becomes more and more suited for the instability to develop, e.g. at t ≃ 50ms after merger.