Wireless (offline install)

Note: Requires access to a Debian workstation with internet connection & two USB sticks.

On another Debian machine, run:

Copy the contents of /lib/firmware/b43 to another USB stick

Run the Debian installer in text mode. When you get to the stage "detecting network hardware", swtich to the second tty (fn+alt+f2), press enter to activate, and run:

Mount the second USB stick

Copy the firmware to the ramdisk's filesystem

Switch back to the installer with (fn+alt+f1)

Your wireless should now be functional.

Credit to Frageda, http://voo.it/debian-on-macbook-pro-101-retina/