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Of course not.

Copy-paste this into some .php file, for example called: unchmod.php

<?php
if (chmod('images/avatars/', 0755))
echo 'Done';
else
echo 'Error';
?>

... upload it into your root host, where is registration.php, login.php, index.php...

In browser type a link: yoursite.com/unchmod.php

You should see "Done" than if rights has been changed.
When its done, delete unchmod.php from host.
And thats it.