Problem with multi database install

I try to use thoses scripts,
Create database (db_0, etc.., db_f, db_vip, db_global)
Install wpmu with db_global for database
etc..
Copy wp_1_XXXX to db_0

Palce all package files in specidier directories.

But when I try to access my plateform wpmu want to go to "wp-admin/install.php"

What can I do ?