Surface pro 6 without 5Ghz networw

[pietro lumare]

Good morning,I have a Surface pro 6 that cannot connect to 5 Ghz network.I hade installed of default an adaptor Marvell Avastar . And thinking that was an adaptor problem I bought a usb adaptor Tp_Link. I gained speed of reception /transmission but no way to see the 5Ghz.I tried to force in the setting the connection with 802.11a. but the PC does not see the network.I have another PC on the same desk with Intel Adaptor and is connected to the same network at 5Ghz and 802.11n protocol.I don't know what to do anumore, becouse it looks to be a problem of surface indipendentlly for the adaptor, c

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