GUI Fix custom symbol not sent to remote controller when installing appliance Server Fix symbol retrieval issue. Ref #1824 Fixes update() missing 2 required positional arguments: 'name' and 'value'. Fixes #1821 #1825 Fix Hyper-V based GNS3 VM WMI issue. Fixes #1822 Release Web-Ui version 2020.4.0-beta.1