Hi @Surya ,
the best process is the following https://confluence.atlassian.com/jiracore/upgrading-jira-server-976161476.html
You should upgrade following this path
6.4 -> 7.0 -> 7.13 -> 8.2 -> 8.20
My suggestion is to perform all these steps in a test environment first.
Hope this helps,
Fabio
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