Update all posts custom fields

I’m using “Types” plugin for custom fields.

I Added a select type field and made a lot of posts with this field in them.

Now i have chnged the values of the select list options and in the site the old values still apear for each post, unless i go into post edit and click update (if i do the “quick editing” it doesn’t work).

So I need a way to update all my 300+ posts now without having to edit each one of them…

Is there a way to that through php function or so…??

Thanks!
Ben