App that forces 2.4 or 5 Ghz?

Hi. I’ve just bought a Cubot Manito running stock Android 6.0. Apparently there’s no way to force a WiFi connection to stay on either 2.4 or 5 GHz. I think this functionality was removed by Google in upstream code (thank you Google!). Is there an app that can achieve this functionality. Is there one on Fdroid or anywhere else?