I used the FOE method. I turned off the FOE on the Primary, did the upgrade on the Primary. Then I turned on the FOE on the Primary and failed it over. Once failed over I stopped FOE on the Active secondary and then did the upgrade there (which failed). When I talked to support, they indicated the knowledge base specifies the installation specifies starting with the Secondary first, but no has been able to tell me why. I can tell you from past experience, it has failed when I did it as per the knowledge base document.
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