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Downgrading from 15.9(3)M10 to any version earlier than August 2019 (e.g., 15.8 or older 15.7 releases) is strictly unsupported . Manual downgrades can lead to a boot loop or impaired functionality.

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If you're evaluating this software for use within an organization or for a specific project, consider creating a report that covers: Downgrading from 15