Separating 2.4 from 5g on white smart hub router

[ukhardwoods]

Hi, I'm trying to connect a new device which needs 2.4GHz to set up. 

I know I can temporarily disable 5G on my router and have logged into admin page, and located the toggle which allows me to disable. 

When I click to 'apply changes' a red 'unsuccessful' message appears. Why is this so?

I've cleared cache & cookies.

Help appreciated 

[Mustrum]

@ukhardwoods   are you trying to do this in the advanced section?

Have you tried another browser?

[ukhardwoods]

Hi and thanks for your help.

I've tried on Safari and Chrome. 

I attach a screen shot of my mobile screen (which does the same). 

The settings I find are under WIFI; BASIC. 

Under ADVANCED the settings do not have toggles. 

[Mustrum]

Thanks @ukhardwoods   I suspect it is also the other changes you have made that the router does not like.

Changing the SSID is not a problem, but then you have also turned off the Broadcast SSID and with no security - I really would not recommend that.