If we're running Confluence 4.0.5, we need to follow an upgrade path which is 4.0.5 > 5.0.3 > 5.5.2. This is a recommended path, that we were able to developed. You can find more information here as well:
There should give you the steps to it.
Actually you don't need to migrate anything. However we do recommend that you have a test environment to apply the upgrade first then to prod.
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