How to Install Intel WiMAX Driver on Debian Bullseye

Installing

2. 2. Looking Up Card Model

   Then to Find Wireless Card Model
   Simply run the Command:

   lspci -v | grep Wireless

   But for the USB Dongles try instead with:

   lsusb -v | grep Wireless

   The grep Command refine the result following the matching Keyword.
   And in the Output you’ll easily See the Card’s Manufacturer and Model:

   

   This to make Sure the Adapter is Supported by this Firmware!
   Eventualy Check the Driver specification page to Find out All Supported Models.
   But if you Do Not find a WiMAX in the Output then instead See: firmware-ipw2x00 and firmware-iwlwifi.

3. 3. 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.

4. 4. Installing Firmware

   Then to Install Intel Wireless Firmware Package
   Simply play:

   sudo apt install firmware-intelwimax wireless-tools

   If Got “User is Not in Sudoers file” then see: How to Enable sudo

5. 5. Loading Firmware

   Now to Load Intel Wireless Adapter
   Just perform:

   sudo modprobe -r i2400m-usb ; sudo modprobe i2400m-usb