firmware-b43-installer package is in contrib repository (I wasn’t aware of this, sorry) so please add contrib to your sources.list, beside bullseye main and non-free.
Now you should proceed with (while rest is looking like very good job of yours):
- get root by
sudo su - add to the
/etc/apt/sources.list:deb https://ftp.debian.org/debian/ bullseye main contrib non-free - execute
apt-get update - execute
apt-get install firmware-b43-installer - execute
isenkram-autoinstall-firmware -
exitto exit root. -
remove bullseye entry from
/etc/apt/sources.listor mark it to something like this:##deb https:// …, save/exit .
Let us know if anything else needed.