Are there any ways to upgrade ARD Hub from version 2.9 or 2.10 to 3.0?
Release : 3.0
Component : CA Agile Requirements Designer
It is not supported to upgrade ARD Hub from 2.9 or 2.10 to 3.0, , because the ARD Hub for 3.0 was completely redesigned and now relies on Keycloak for authentication and security, which the earlier versions of Hub did not.
The Migration of flows is explained at Migrate Flows Into ARD Hub in the Manual.