Application Repository admin default password


I'm installing SBM in a test environment and when opening the Application Repository (in my case http://localhost:8085/mashupmgr/) I can't login because of unknown admin's password. I've read the installation guide, but there is no hint as of what the password is. I've tried to change it to emty and null (directly in the DB, I still have the original string though) but it doesn't work.