Migration from XI 3.0 to XI 2

We have the requirement to migrate WebIntelligence Reports and Universes from XI 3.0 to an existing

XI 2 platform.

As far as I know WebI reports and universes in XI 3.0 are not backwards compatible to XI 2.

Is there in spite of this fact some way to do this migration without rebuilding all reports and universes?

Best regads

Jon Nedelmann