So, 1and1 answers...professional. they changed nothing and told me to rewrite the "functions-db-MySQLi.php" from "admintoobject" to "admin_to_object" - but is it possible? in the file i cant find a line with the content "admin"...do you see any chance to get the restore work right?
i've also a backup from the database made in myphpadmin. will it also works, if i try this backup or will content be lost?