Maybe I should describe for the other people how I reached the target...
I created a file called fixperm.php
wrote the following in it:

<?php
chmod('/the/way/to/the/target_folder/', 0777);
?>

(the target_folder is the folder which attributes has to change)
I copied the fixperm.php in the root ...

Thank yaaa!
disc

I think I have nearly the same problem. I know I have to change the atrributes of the theme folder but I am not able. I tried it with FTPUploader and with the provider WebFTP . Especially the folders of themes I got with Spartacus are not to change. Maybe there is an easy solution but couldn find it ...