Hi,
look here: https://technet.microsoft.com/en-us/library/jj966220(v=office.16).aspx
“To apply software updates to a multiple Office Online Server farm, you first remove one of the servers from the load balancer pool and from the farm, apply the software update, and create an updated Office Online Server farm.”
The cmdlets you need are in that article.
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Comment on SharePoint security fixes released with June 2016 PU and offered through Microsoft Update by Piotr Siódmak
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