To install firmware-brcm80211 just follow these instructions.
/parrot/jollyroger/non-free///install/index.html Binary firmware for Broadcom 802.11 wireless cards supported by the brcmsmac or brcmfmac driver. Parrot 3.7 non-free/kernel 20170404-0parrot0
sudo apt-get install firmware-brcm80211
Which will install firmware-brcm80211 and any other packages on which it depends.
|Maintainer||Debian Kernel Team |
|Description||Binary firmware for Broadcom 802.11 wireless cards supported by the brcmsmac or brcmfmac driver.|