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Stop all running Oracle services.
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Replace the OPatch folder in the new Oracle home with new opatch as follows:
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Take a backup of ORACLE_HOME/OPatch into a dedicated backup location.
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Make sure no directory ORACLE_HOME/OPatch exists.
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Unzip the OPatch downloaded zip into ORACLE_HOME directory.
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To check the version of the opatch utility installed in the above step, go to the OPatch directory and run opatch version. Result should be (or a higher version):
OPatch Version: 12.2.0.1.40