FRITZ!Box on Twitter: "@jiribrejcha You do have the option to disable 2.4 GHz. Go to Wireless > Radionetwork and uncheck the box 2.4 GHz. You can also adjust radio channel settings at
WLAN trennen bei Fritzboxen (2,4 GHz und 5 GHz) - knowaTEL GbR - Ihr Partner für Telekommunikation in Winsen (Aller)