Odd. If you have no pods yo should be able to seperate the bands and give them different names which will help with 2.4 only devices. Support should be able to help with this. I ahve pods so stuck and cna;t modify much. Good luck!
On my fire stick I didn't have to change anything, it will connect on 2.4 g and 5 g, tho 2.4 g works better, you don't say what gateway you have, I think you need to hold in the reset button on the back for 30 seconds to reset it, you will lose any custom settings you made