Forcing a device to use the 2.4GHz network after installing Wi-Fi pods

Since I installed two pods to fix spotty Wi-Fi coverage, half of the house automation is malfunctioning because it is no longer possible to separate the SSIDs of the two frequencies since the pods are active. I must have the controller of the smart devices on the same SSID at 2.4GHz, but once the artificial stupidity baked into comcast router decided to associate it to the 5GHz I have no way to force it back to 2.4GHz and all the devices it controlled are now orphan.

Short of getting rid of the pods, what solution do I have to force the device to the 2.4GHz? The only temporary solution has been to create a different SSID with an old router, but I am back to square one with the poor coverage that I tried to fix with the pods and have to deal with a partitioned network.