3.2 The method of performing an update installation to migrate an existing J2EE server
If you perform an update installation to migrate a J2EE server set up in version 09-87 or earlier to an environment that uses version 11-00 or later, the already set up existing J2EE server automatically uses V9 compatibility mode.
For details on performing an upgrade installation to migrate from an earlier version, see Chapter 10 in the manual uCosminexus Application Server Maintenance and Migration Guide.