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Clear the upgrade directory from both servers before reattempting further upgrades using the command rm -fr /var/log/sonus/upgrade/* under all the following conditions:

• Performing LSWU from a pre-5.1 version to a 5.1 or later version.
• There is a need to revert the upgraded server after a single server upgrade while the peer is still on an older version.
• A revert will be performed by doing a re-ISO.