DFS Wifi connection using SSH

I’m looking to get a GL-AR750 to repeat a DFS wifi connection but it wont connect using the usual webpage interface.

So I have learned how to log into the router using SSH and done the command:

vi /etc/config/wireless

and edited its connection from the details of a connection to another wifi with the DFS wifi which I want to connect to, so I’ve changed to the DFS wifi’s ssid, bssid, and encryption ‘none’:

config wifi-iface ‘sta’
option network ‘wwan’
option mode ‘sta’
option ifname ‘wlan-sta’
option ssid ‘…I have changed this…’
option bssid ‘…I have changed this…’
option channel ‘1’
option device ‘radio1’
option encryption ‘…I have changed this to ‘none’ as its an open wifi…’
option disabled ‘0’

Then saved the changes, but no joy, it just stays connected to the wifi it was previously connected to.

I apologize for being a newb to SSH etc but what am missing in terms of how to connect the GL-AR750 to a DFS wifi?

pls check this guide GL-AR750 joining/repeating a DFS network - #2 by alzhao