Is it possible to make USG20W-VPN work simultaneously in 2.4 and 5 GHz bands?
For internal wireless, USG20W-VPN support one
channel at one time.
Go to Configuration>Object>AP
Profile>Radio, you will see the default profile is 2.4G channel, and
default2 profile is 5G channel.
Go to Wireless>AP management>Select which
channel and SSID profile you want to use