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To upgrade the Apex One server and Apex Central, please refer to the document available at https://docs.trendmicro.com/all/ent/apex-one/2019/en-us/apexOne_2019_iug.pdf.

You can also refer to the KB article at https://success.trendmicro.com/solution/KA-0013155 to control which agents will be upgraded in Apex One, in order to avoid high bandwidth consumption.