Arch Linux - How do I downgrade my kernel?

Arch Linux - How do I downgrade my kernel? I just did a system upgrade which included my kernel. After which, my wifi has broken. After some google'ing, it seems I'm not the only person this has happened to.
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Guest [Entry]

"If you haven't cleaned the older kernels yet, they should still be available in the grub menu. I had this problem as well, when I installed the new kernel, my driver failed to work as well. A simple fix is to put the default option on the grub menu to the right kernel.

If you are using grub 2, this would be the way to check what the default option is.

jeffrey@ubuntu-linux:~$ head /etc/default/grub

If you change this file, run 'update-grub' afterwards to update
/boot/grub/grub.cfg.

GRUB_DEFAULT=0

GRUB_HIDDEN_TIMEOUT=0

GRUB_HIDDEN_TIMEOUT_QUIET=true

You can change the grub_default value very easily, 0 would indicate the first option, 2 should be a previously used kernel.

gksudo gedit /etc/default/grub

Change the value, save it and run

sudo update-grub

If you are using an older grub version

You should edit this file:
/boot/grub/menu.lst

Do the same steps, but grub_default is just plain ""default"" in this file. Run the update-grub script, reboot and you're fine to go."