|Upgrading CloudBees CD/RO versions between 5.x and 8.2 that are using the built-in (default) database is not supported. This means that you must switch to an alternate CloudBees CD/RO-supported database before your upgrade. For instructions, see Switching to an alternate database.
|Link to the upgrade process steps
For a detailed description, see the KBEC-00041 - CloudBees CD/RO TCP port usage-diagram and descriptions KB article.