Hey guys,

I first tryed to follow this tutorial since I saw multiple posts that said that it worked for them.
The problem was that when I launched the dpkg command, I got some error messages (here's the log file) and when I restarted my computer, I still had no way to connect to a wifi network.

If you're having the same problem, here's a way to fix it:

OPTIONAL: For those who are using Kali as a live USB, make sure you have a persistence USB drive, if not follow this guide to make one. Otherwise, you won't be able to save what you did. Furthermore, to be able to have a working ethernet connection you will have to connect your ethernet cable before starting the OS. To be able to see boot options, keep pressing Option/alt key directly after having pressed your startup key.

- First make sure your system is up to date
Code:
apt-get update && apt-get upgrade
- Remove the old wireless driver:
Code:
 apt-get purge bcmwl-kernel-source
- Download the the latest source file and place it in /lib/firmware/brcm
- Reboot and normally you will be able to connect to wifi networks

I hope that helped some of you, please notify me if there's grammar/spelling mistakes.