I can assure you that these notes do work. I use them every time I use the b43 driver for my broadcom 4318 card and I've used them with quite a few other people with various broadcom cards including the 4306.
You won't get anywhere trying to create a link to a wireless network without this firmware installed, when you have it installed all the rest is done automatically for you.
Your code output leads me to believe you haven't used the cd command correctly to enter the directory where you have stored the broadcom-wl-220.127.116.11.tar.bz2 file.
Do remember when you work through this that in linux all commands and directory names are case sensitive. If the command demands a capital letter and you type a small one it fails. The same for file names and paths.
Let's expand the notes a bit. Not surprisingly, I have a user of bbfuller on this computer. Lets suppose I downloaded the "broadcom-wl-18.104.22.168.tar.bz2" file into that users Download directory.
I would use the command:
to move into that directory and then possibly:
to list the contents to assure myself I'm in the right place.
Then the command:
tar xjf broadcom-wl-22.214.171.124.tar.bz2
would extract the files from that archive and put them in a directory of its own in Download called:
The file I want will be in a sub-directory of that called "driver". So to get there I would use the command:
Note there is no leading slash this time, I'm specifying a path relative to where I'm located, not from the top of the directory/file system.
Then I'd use the command:
b43-fwcutter -w /lib/firmware wl_apsta_mimo.o
That would give output like:
This file is recognised as:
ID : FW13
filename : wl_apsta_mimo.o
version : 410.2160
MD5 : cb8d70972b885b1f8883b943c0261a3c
and some two dozen other lines as well.
Then I'd reboot. Then I'd locate the NetworkManager icon in the system tray of either Gnome or KDE, left click on it, and expect to be presented with a list of available wireless networks waiting for me to left click on mine.
You "may" be unlucky if your card is a really odd one and isn't recognised, though it should be from the model number. But I know the instructions work because I used them last week when I reinstalled on my laptop.
Give them a go and come back with questions or problems.