We are currently using mautic 2.16.5 and want to upgrade it to 4.4.9. However I created a new mautic instance 4.4.9 and tried to do database migration but it is not working as there are multiple errors which i am receiving while dumping the data to new DB.
Also i tried a manual approach where I just copied the contacts and emails from old DB to new DB it worked fine. However it was not having the statistical data as well as images in email was missing.
Can someone suggest me the best approach which I should be following for the upgrade.