samannan20

Open root terminal
Run the following
apt update
apt install firmware-b43-installer
cd /etc/NetworkManager
change 'managed' to true and save
apt-get install gdebi linux-image-$(uname -r|sed 's,[^-]*-[^-]*-,,') linux-headers-$(uname -r|sed 's,[^-]*-[^-]*-,,')
wget http://ftp.de.debian.org/debian/pool/non-free/b/broadcom-sta/broadcom-sta-dkms_6.30.223.271-23_all.deb
gdebi broadcom-sta-dkms_6.30.223.271-23_all.deb
modprobe wl