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Step 1. Install the broadcom-wl driver (broadcom-wl.noarch : Common files for Broadcom 802.11 STA driver) using sudo yum install broadcom-wl OR yum install broadcom-wl.

Step 2. Depending on your wireless card model, you might need to install b43 driver. Install using sudo yum install b43-fwcutter OR yum install b43-fwcutter.

Step 3. Reboot to the BIOS options, and deselect the Secure Boot if you haven't already. After login, the wireless should work on its own, but if not, go to a terminal and execute modprobe wl OR/AND modprobe b43 to recognize it. Hope this would help you. For more information check Dell Inspiron 1545 Manual.