The focus of the final phase is to close the project and hand over the final solution to the organization.
Usually just one.
In addition to general refinements the risk and problem lists should be updated.
Create the initial iteration plan to detail who will be doing what in the iteration.
Review and finalize the solution architecture document, preparing to hand it over to the maintenance organization as the development project comes to an end.
Finish the phase with an iteration report that lists achievements and lessons learned.