The v3.1 was already an update for dual layers
I made the v3.1 upgrade and it works perfect with the European High 2008.2 and 2009.1 dual layers on my MKIV.

I have also made a second 2009.1, removed the languages: French, Spanish, Italian and German, I use only English.
And now it fits on a DVD5.

For explanations take a look at Gaza’s post
http://www.xoutpost.com/544818-post114.html