WIRELESS WIFI CARD
Dell XPS 14 (L421x) Ultrabook Wireless WLAN Card Removal and Installation

This how-to guide shows the removal and installation of the Wireless WLAN Card on the XPS 14 (L421x). If you need any of the parts spoken about they are linked at the bottom of the post. A small phillips head and T5 star screw driver are the only tools needed for this repair.