now do the adition i mentioned earlier to /etc/apt/sources.list
and isntall firmwares you need
it shoudl isntall only firmwares and not update/upgrade/change any other package
and you will have exacly effect you asked for.
edit /etc/apt/sources.list , add line:
#Debian non-free for firmware packages
deb http://deb.debian.org/debian bullseye non-free
then run:
sudo apt update
#optional intel graphics:
sudo apt install linux-firmware-nonfree
#optional rtl8166
sudo apt install realtek-firmware
if you have atk9k wifi and wish to have bluetooth workin:
sudo apt install firmware-atheros
i am very happy that i was able help.
have fun.