Is 5Ghz band available in data offload mode on the nighthawk m6?

I consider buying a nighthawk M6, but before I do that, I need to know which frequency bands are available in data offloading mode. My current M1 only supports 2,4 Mhz when offloading data from another WiFi network, which is too slow for my KEF LSX speakers. I would at least need 5 Ghz. Does anyone know how this works in a M6 model? Thanks in advance! Kindly Jo