Within Inventory Manager to can specify how to download the images. Select the Firmware Mgmt tab, then find the Summit Series under Device Type. Find your Summit, select and then select the General Tab. The General information about the Switch will be displayed, Module Type, Binary Family, Default File Transfer Method, Firmware Down MIB, Configuration MIB (both of these will be set to script). In the Device Family Definition File Name: ExtremeXOS - TFTP would be shown, if you select View is does indeed use the VR-Default Interface. So here you can change to use VR-MGMT. In the Drop Down menu select ExtremeXOS - TFTP (VR-MGMT).