I think he meant he was trying to delete the file as root. That should work unless the file is still open by someone else.
~ $ touch /home/user/removeme ~ $ ls -al /home/user/removeme -rw-r--r-- 1 user users 0 Jul 23 20:00 /home/user/removeme ~ $ devel-su Password: BusyBox v1.20.0.git (MeeGo 3:1.20-0.2+0m8) built-in shell (ash) Enter 'help' for a list of built-in commands. ~ # rm /home/user/removeme rm: remove '/home/user/removeme'? y rm: can't remove '/home/user/removeme': Permission denied