MySQL makes stuff easy 2
How to convert old html-symbols to utf-8 automatically in MySQL?
i did it with REPLACE():
UPDATE `articles` SET `title` = replace(`title`,'ä','ä');UPDATE `articles` SET `title` = replace(`title`,'ö','ö');UPDATE `articles` SET `title` = replace(`title`,'ü','ü');
… worked with all my old tables
