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Download & install bios from this link dell.to/2sFtQNn
Open device manager – expand network adapter & right click on the wireless driver & click on uninstall (check the box that says delete driver) do not restart the computer. Install the chipset driver first followed by the wireless driver & restart the computer.
Disable the anti- virus on your computer & the wireless password & try connecting to the network & check if there is any error listed.
What is the operating system installed?
Click on my Dell username & send a private message with the service tag, registered name & email address.