Advice on upgrade from version 3.0.8 to 4.0.6

CMS Version: 3.0.8 to 4.0.6
Installation Method: Custom install

Hi, i want to know what is the correct way of upgrading from version 3 to 4. Do we upgrade the CMS first or upgrade the database from version 5.7 to 8.0?

I recently did an upgrade where I upgraded the CMS first and no issue was found then I upgraded the database and all my display shows as offline. Any idea?

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