I have the ability on my Iphone to select 2.4ghz or 5ghz from my Netgear R7000 Night router.
Also, thru the Netgear app I can disable the 5ghz channel if necessary.
The YI Outdoor Security Cameras connection specs say 2.4ghz.
All I can tell you from my iOS experience
I have to put my iPhones on 2.4ghz to install the cameras thru the YI app
Once installed, I turn my iphones back onto the 5ghz signal and have no issues.
Tinkerer