[rootlinux]

Try creating your tsk package and link it in your config_operator.txt and see if that works.

If you need a quick change to just one graphic try opening another tsk file by renaming the tsk extension to cab.
Open with winrar and replace the graphic you need.
Make sure the names are the same.
Rename the cab and save it.
Rename the cab extension back to tsk and try it.
Add the NEW tsk file name to config_operator.txt and remove the old one.
Save config_operator.txt

That should work.