This question is in reference to Atlassian Documentation: Skipping major versions when upgrading JIRA applications
What is the recommended process for upgrading from JIRA 5.1.1 to 7.x (self-hosted on linux)?
You've already got the docs I'd start with. I would not recommend 5.anything to 7. Go to at least 6.3 before the jump to 7 (and I'd strongly recommend 6.4)
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