The upgrade instructions are available at Oro documentation website.
The current file describes significant changes in the code that may affect the upgrade of your customizations.
- The
*.classparameters for all entities were removed from the dependency injection container. The entity class names should be used directly, e.g.,'Oro\Bundle\EmailBundle\Entity\Email'instead of'%oro_email.email.entity.class%'(in service definitions, datagrid config files, placeholders, etc.), and\Oro\Bundle\EmailBundle\Entity\Email::classinstead of$container->getParameter('oro_email.email.entity.class')(in PHP code).