There are two ways to migrate a Control Manager 2.5/3.0 database:
Install Control Manager 3.5 to a Control Manager 2.5/3.0 server — this is the recommended method
The Control Manager 3.5 setup will automatically upgrade the database to version 3.5. Refer to Control Manager agent migration for more details.
Manually transfer Control Manager 2.5/3.0 database to Control Manager 3.5 server