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MySQL 5.5 Reference Manual
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Excerpts from this Manual Downgrade Paths

  • Downgrade is only supported between General Availability (GA) releases.

  • Downgrade from MySQL 5.5 to 5.1 is supported using the logical downgrade method.

  • Downgrade that skips versions is not supported. For example, downgrading directly from MySQL 5.5 to 5.0 is not supported.

  • Downgrade within a release series is supported. For example, downgrading from MySQL 5.5.z to 5.5.y is supported. Skipping a release is also supported. For example, downgrading from MySQL 5.5.z to 5.5.x is supported.

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