After a successful or a failed upgrade, you can downgrade Oracle Clusterware to the previous release.

• About Oracle Grid Infrastructure Downgrades
  Understand the process and impacts of Oracle Grid Infrastructure downgrades.
• Options for Oracle Grid Infrastructure Downgrades
  You can downgrade Oracle Grid Infrastructure to earlier releases after a successful or a failed upgrade.
• Restrictions for Oracle Grid Infrastructure Downgrades
  Review the following information for restrictions and changes for downgrading Oracle Grid Infrastructure installations.
• Downgrading Oracle Standalone Cluster
  Use this procedure to downgrade Oracle Standalone Cluster after a successful upgrade.
• Downgrading Oracle Domain Services Cluster
  Use this procedure to downgrade Oracle Domain Services Cluster after a successful upgrade.
• Downgrading Oracle Grid Infrastructure when Upgrade Fails
  If upgrade of Oracle Grid Infrastructure fails before CVU post upgrade checks succeed, then you can run gridSetup.sh and downgrade Oracle Grid Infrastructure to the earlier release.
• Downgrading Oracle Grid Infrastructure Using Online Abort Upgrade
  If upgrade of Oracle Grid Infrastructure fails before setting the active version of Oracle Clusterware, then follow these steps to downgrade Oracle Grid Infrastructure to the earlier release.