Do you mean upgrading from an earlier version to SQL CE 2.0? I've written an app which includes the SQL CE 2.0 db engine, and it's seems to have worked for the axim people here, although I doubt many of them would have had an earlier version of SQL CE installed already.
Anyway, if you want to try the setup, it's here:
http://xmltvview.birtles.org.uk/epgviewer.html