  We derive the parallel upper critical field, Hc2, as a function of the
temperature T in quasi-2D organic compound lambda-(BETS)2FeCl4, accounting for
the formation of the nonuniform LOFF state. To further check the 2D LOFF model
we propose to study the Hc2(T) curve at low T in tilted fields, where the
vortex state is described by the high Landau level functions characterized by
the index n. We predict a cascade of first order transitions between vortex
phases with different n, between phases with different types of the symmetry at
given n and the change of the superconducting transition from the second order
to the first order as FeCl4 ions are replaced partly by GaCl4 ions.
