Using the Riverbed Cloud Portal : Managing SteelHead-c virtual appliances : Changing appliance RiOS version
  
Changing appliance RiOS version
You can change the version of RiOS running on the appliance in the Appliance Summary page.
Note: This feature is available to appliances provisioned through the portal to the AWS cloud platform. RiOS software on appliances on other cloud platforms can be upgraded through the SteelHead Management Console or Riverbed CLI commands.