netbackup upgrade

I have netbackup software version 8.0. I need to upgrade to the latest version 8.1.2.
I have one master server and two media servers. All of them runs windows server OS.
Could you tell me how to upgrade this backup software, or point me to step by step article that explain the process.
dedriAsked:
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yo_beeDirector of Information TechnologyCommented:
Do you have support with them?  If so I recommend that as a first option.  I find that this true for any products.
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kenfcampCommented:
I've never done it myself, but the upgrade documentation can be found here -> https://www.veritas.com/support/en_US/article.000115678#8.1.2

Ken
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