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While Upgrading/Downgrading HDP in Ambari, if you see "Unable to determine the stack and stack version" it is possible the repo version has some inconsistency.

Post Ambari2.6.x, should have repo_version table "resolved" column as 1 - If it shows "0" then run below update query.

update repo_version set resolved = 1

Re-start Ambari and then attempt the operation again - it should go through.

Note: As of now it is not a BUG as we could not able to reproduce the issue.

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