Repair SugarCRM migration problem from 5.5.0 to 6.0.1

Hello i upgrade my SugarCRM production server from 5.5.0 to **6.0.1** using the upgrade tool from the admin panel ... the pre checks end with no problem so i do the upgrade ... after the upgrade, a blank page appear .. so i go to root page and the sugar is working, but the screen is not right ... no look weel ... like no design or with a bad theme ... I log on and go to themes wizard .. and see that only one theme is show : SugarCRM 5 theme ... maybe this is the problem So i need the new versi?n working, and upload the spanish module ... Thanks