There is NO way to rollback to Anna ..
BTW why do you want to do that ? Though many users are of the opinion that Anna was better, you will find many with the opposite opinion too ...
i had nokia E6. since last 1 year i can not use slide down menu from any screen.i tried some stuff from internet any they said that can ocure because of phone get fall down or struck hardly with something else.but actully none can occure with me and this(slide down menu) happen sunndly and stooped working.
so can any one sort out this problem?