@user_3357111 hi!
By now, the S5700 and USG firewall support the management via web UI.
To configure the device from the web UI, you should connect the device to the local PC, which can be achieved by adding the Cloud into eNSP.
Then connect the device to the Cloud and bind the cloud to the local loopback interface and configure the IP address. After that, you can manage the device via web UI.