WordPress MU

after uploads some themes and use one of them as default my wpmu frontpage (first page after installation, as wordpress.com), now my index page is the blogs page.
how can i this page?

There are 2 different WordPress Default by Michael Heilemann themes.

One is

WordPress Default - The standard one

the other is

WordPress Default/home - This is the one that has the index page you are now missing.

I found the way to correct your issue is to go to Site Admin --> Themes

Disable WordPress Default
Enable WordPress Default/home

Then go to Presentation

Select the WordPress Default as your theme and you should get your home page back.

thanks :)
so i must work on my favorite theme to get the same listing.