Follow the below steps for Successful Upgrade/Migrate.
2. Product Compatibility Check, Remove the non compatible extension if it is not in use
3. See if ePO is up and running, Backup
4. KB82808, Migrate.zip (Copy Migrate.zip to new server)
5. Shutdown old ePo Server, Change IP and Hostname of new Server
6. Extract Migrat.zip
7. See if you are able to login to ePO Console
9. ePO Install/Upgrade Pre Check tool