I have Windows Dell Inspiron 15 5548 Laptop which is unable to find the wifi network. I have Sagecom 5688W router which is configured with two separate 5Ghz and 2.4Ghz networks. I am able to connect all other devices properly but facing issue with this Laptop. I have updated all the network drivers as well. I am left with no option than to ask here.
Try editing your 5ghz band settings and lower the security setting to WPA2 (lowest I think). You laptop firmware and drivers may not accommodate newer high-level security settings.
Tried changing all the security levels but still didn’t work
Well, you have tried the obvious fixes - updating drivers and changing security settings. Try a reboot of both the laptop and the gateway.
Did you try 2.4 GHz and WPA/WPA2?
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