Migrate legacy instances
Rather than upgrade legacy instances (running an OpenAM or AM version that is no longer supported), you instead manually migrate from your existing deployment to a new deployment.
For complex legacy deployments, ForgeRock can assist you in the migration process.
Upgrade a legacy deployment
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Prepare your customized AM WAR file. 
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Prepare a new deployment, installing servers from the new, customized WAR file, starting with the instructions in Install AM. 
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After installation, configure the new servers in the same way as the old servers, adapting as necessary. You can use the ssoadm do-batchcommand to apply multiple changes with one command.
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Validate that the new service is performing as expected. 
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Redirect client application traffic from the old deployment to the new deployment.