Hi Andreas,
Our company is actively doing migration of portals developed using a older version of liferay to the latest version. As most of the time, it is not direct one to one export / import of LAR files or running the upgrade scripts. There are so many things involved in the whole migration process which i am in the process of documenting and publishing soon.
If you can send across what exactly the kind of problem that you are facing then we can give you a proper solution / answer.
Ahmed Hasan
mPower Global Inc.
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