Oracle Database Appliance ships from the factory with a default ISO image preinstalled.
To use Oracle Database Appliance Virtualized Platform, you must reimage Oracle Database Appliance.
Go to My Oracle Support note 888888.1:
https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=888888.1
Download the required ISO image.
Refer to the readme
file for detailed installation instructions.