I finally succeeded copying navit.xml file back to usr/share/navit folder using 'becomeroot'. But still it is not working. Navit application is looking for maps bin file from the root directory, though I changed its path to /media/mmc1/ folder on SD Card in the navit.xml file.

After navit.xml file is changed and copied back to root, do I need to do any sort of compile or something?