is it possible to downgrade RSA 8.4 version to 8.3 version?
if yes, please share any KB article.
No, it is not possible to downgrade to AM 8.3 from AM 8.4
You would have to delete the AM 8.4 VM and deploy a new v. 8.3 VM .ova file, then run quick setup again to make it a primary or replica.
If you have a hardware appliance, you could 'factory reset' back to AM 8.3 or any other supported version for specific hardware model then run quick setup.
See Knowledge Base, KB 000034277 - How to factory reset an RSA Authentication Manager 8.2 hardware appliance without a factory reset button from the Operations Consolehttps://community.rsa.com/docs/DOC-62265
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