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Will Sonos net still be using 2,4 after this new firmware with 5 GHz support? And how to select channel?

No. 5GHz WiFi support has been extended to a number of additional devices.

https://support.sonos.com/s/article/126


In general I think that you should allow SONOS to choose the band, but you could steer things by using different SSID’s. Regardless, surrounds and a surround SUB will use a private 5GHz connection. Currently, there is no way to select a specific 5GHz channel.