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Hi @Lariax,
I've just looked in an Xperia Z2 with the latest software installed and there appears to be no setting for this.
Please sony update this feature in android 6.0.1.
Hi @Lariax,
I looked in an Xperia Z2 with Android 6.0.1 installed and there is no option to change this I'm afraid. You will need a router that supports the 5GHz bandwidth if you wish to connect to a network using that bandwidth.