If your router supports 5ghz connectivity the next thing to do is to check your adapter open device manager by pressing the windows key on your keyboard typing device manager and opening the result.
Wifi adapter hardware 5ghz.
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In the property box select the preferred band option.
Go to the advanced tab of the wireless adapter properties.
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From the list of drivers you see in the device manager expand network adapters and locate your wireless adapter see its name and see whether it says anything about the radio bands it supports.
Here s another thing that you can try to enable 5ghz wifi and solve the 5ghz wifi not showing up in windows 10 issue.
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I came across a similar question on the forum which gave this as an option.
Hello i have the realtek rtl8723be 802 11 bgn wi fi adapter with windows 10 and want to know if i can upgrade or install a differant card allowing both 2 4 and 5ghz.
Hi guys im running qualcomm atheros ar9485 802 11b g n wifi adapter which only supports 2 4ghz i would like to upgrade to 5 0ghz whats the 5628764.