Nav 5.0 DB on Nav Classic Client

Dear all,

Unfortunately I have opened the NAV 5 DB(native) on Nav Classic Client. And I have seen some newly created tables in the Object designer
{2000000071 …2000000079 Series Tables ID. }

I’m not able to remove those tables from the db.But I need this DB on version nav 5.0

How to downgrade from Converted DB(nav2009) to Nav 5 DB ?

Is this converted db have any extra object level property which are not present in NaV 5 DB ?

kindly reply [:’(]

Backup the data and restore back into a 5.0 databse with the correct objects.