Below is the link to the migration process.
https://hitachivantara.sharepoint.com/:b:/s/UCPAdvisor391/ERofwlaH8DlAvDRCCqy--Q4B9tt9Q93MpFpqEYk6BcPV2Q?e=079Lc5You can find the Migration Tool User Guide on the Support Portal here (login credentials required): https://knowledge.hitachivantara.com/Knowledge/Converged_Systems/Systems_with_UCP_Advisor/How_to_Migrate_UCP_Systems_and_Devices_from_UCP_Advisor_310-311x_to_41
Please follow the SRT training video for more guidance and demo for UCP advisor 3.x to 4.1 migration.