For more details see the Knowledge Center article with this video: https://amzn.to/2LlioCb
Ashita shows you how to upgrade your EC2 Windows Server 2012R2 instance OS to Windows Server 2016.
Link in video: https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/Creating_EBSbacked_WinAMI.html
Publisher: Amazon Web Services
You can watch this video also at the source.