Guest WiFi 2.4ghz only

[Matty13]

Hello. Sorry if this has been answered before. 
I have some new light switches that are WiFi enabled but only work with 2.4ghz. I’m having trouble connecting them so would like to set my guest WiFi to 2.4ghz only. 
 I have the the grey rectangular hub. 
thanks I’m advance for the correct answer. 

[Jayach]

Assuming you are not on Pro, it should be possible. 

However, if you have the above options, perhaps temporarily make the main Wi-Fi 2.4Ghz only whilst you set them up, and switch back to combined after.