more working nixpackage for unlocking cellular modem on nixos

configuration.nix

  networking.networkmanager.fccUnlockScripts = [
    {id = "8086:7560"; path = "${pkgs.lenovo-wwan-unlock}/bin/fcc_unlock.sh";}
  ];

documentation

Sometimes modemmanager times out while running the unlock script and I have to run it manually with:

sudo /etc/ModemManager/fcc-unlock.d/8086\:7560 whatever wwan0 wwan0at0 wwan0at1 wwam0mbim0

which seems to work

easy-lenovo-wwan-unlock.nix

{ stdenvNoCC, fetchurl, lib }:
stdenvNoCC.mkDerivation rec {

      #name = "lenovo-wwan-unlock-${version}";
      pname = "lenovo-wwan-unlock-easy";
      version = "2.0.0";
      
      src = ./wwan-unlock.sh;

      # I like to keep the file locally in my repo, but you can also download it from here
      # this PR, specifically: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/1141/diffs?commit_id=2734ac25191264e6d786af8a9577fb51519cb846
      
      
      /*src = fetchurl {
        url = "https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/raw/2734ac25191264e6d786af8a9577fb51519cb846/data/dispatcher-fcc-unlock/8086";
        hash = "sha256-QuAC2a0renRZQsZvWfTEE9a/Pj6G+ZhGEmYtVagaurE=";
      };*/

      dontUnpack = true;

      installPhase = ''
        runHook preInstall

        mkdir -p $out/bin/
        cp -v $src $out/bin/fcc_unlock.sh
        chmod +x $out/bin/fcc_unlock.sh
        patchShebangs $out/bin/fcc_unlock.sh

        runHook postInstall
      '';


      meta = with lib; {
        homepage = "https://gist.github.com/BohdanTkachenko/3f852c352cb2e02cdcbb47419e2fcc74";
        description = "Easy unlock for Lenovo PC wwan.";
        license = licenses.cc0;
        platforms = platforms.linux;
        maintainers = [ "The Internet's Beloved Princess Grace" ];
      };
  }

flake.nix

   # add the package to nixpkgs in an overlay   
      
      modules = [

        ({ config, pkgs, ... }: { nixpkgs.overlays = 
        [ 
          (self: super: { 
            lenovo-wwan-unlock = super.callPackage ./easy-lenovo-wwan-unlock.nix { };
            }
          )
        ]
        

Annoying. Mine looks like it's using the iosm kernel module if that helps.

My relevant devices are (according to mmcli): wwan0 (net), wwan0at0 (at), wwan0at1 (at), wwan0mbim0 (mbim), no qmi or cdc that I know of.

After messing with these kernel modules for days, I decided to open up the laptop and confirm which modem model # was even in here. You should have seen my face when I noticed the M.2 slot was empty 😂 🤦

Who sells a new laptop SKU with "... 5G" in the title, a nano SIM slot in the side of the chassis, but then doesn't include the modem?! Haha

Oh well, mystery solved for now at least. Thanks!

Oh, yep, that'd do it. Best of luck!