Any way to delete system files on s40v5fp1 Nokia?

Does anyone know of a way to delete files with the system attribute on a Nokia s40 v5 fp1 phone? I want to get rid of the demo games and some themes and wallpapers on my 2720 camera phone to free up some memory. The memory is limited to only the 9mb available on the phone.

I’ve already tried Nokia PC Suite, MobiMB, MOBILedit! and Oxycube. None of the java browsers are allowed access by the phone.