I recently followed this process to migrate from JIRA Cloud to standalone and received the below error when trying to access jira.
Failed to start JIRA due to a build number inconsistency.
The data present in your database is newer than the version of JIRA you are trying to startup.Database build number: 100001JIRA app build number: 71011
Please use the correct version of JIRA. You are running: 7.1.7#71011-sha1:2526d7c13af2ab43673b0a163ceecff6fe735c9c
Did you try this workaround?
https://confluence.atlassian.com/jirakb/import-from-cloud-to-standalone-failed-to-start-jira-due-to-a-build-number-inconsistency-722145047.html
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