Manjaro installation doesn't offer any WLAN connections.
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Connect the device to the internet through ethernet, phone-to-USB or other available method.
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Uninstall current drivers:
sudo pacman -Rns linux419-broadcom-wl -
Make sure Manjaro installation is up to date:
sudo pacman-mirrors -f 5 && sudo pacman -Syyu -
Install required linux kerner headers:
sudo pacman -S linux419-headers -
Install the "dkms" packange:
sudo pacman -S dkms -
Once finished, unplug all internet conections and reboot.
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If there is still no WLAN available, install following driver package:
sudo pacman -S broadcom-wl-dkms -
Again, unplug all internet connections and reboot.