This is more a of a router issue I believe. I’m using a netgear Mk63 Mesh Router and satellites and for some reason the firestick will only connect to the 2.4ghz and not the 5ghz. I have no way of choosing manually because the mesh Wi-Fi is a single name. Although my download speeds are fine. I’ve searched extensively on Netgear forums to no avail.
My thought is that the 5GHz band is turned off in the settings. I think there is an app for it but I’ve never tried it.
What firestick do you have? If you know how to get into the network settings on your firestick then scroll down and click “See All Networks” and your network name (SSID) maybe there with the 5G after it so it will look similiar to this SSID_5G
I am not sure about your setup by on my asus mesh system both wifi bands are combined into one. If thats the case it might just be showing that. A way to check is try your phone and see what happens. What the mesh system is “supposed to do” is pick the best availiable. This should be all found in your router setting and can be switched back. EDIT… most systems can be switched
Also for some reason I haven’t yet figured out the Firestick may not connect to the 5GHz until you go into your router settings and change the port to around the 40 range. I know, another thing for you to learn. I have a tool that I use to see how many ppl in my immediate area are on the 5GHz and what channel they’re on and then I can choose a channel with fewer or no users. FYI I changed mine to 44.