How to Install Realtek Firmware on Debian Bullseye

Installing

2. 2. Enabling Non-free Repo

   How to Add Debian Non Free Repo Preserving System

   Step by step Guide

   Link to Step by step Debian Non Free Repository Setup Guide

3. 3. Installing Realtek Firmware

   Then to Install Realtek Firmware on Debian
   Simply run:

   sudo apt install firmware-realtek

   And possibly reboot to load it:

   sudo reboot