diff --git a/MMDVMHost/module.nix b/MMDVMHost/module.nix
index 3190dbd..4a8f14d 100644
--- a/MMDVMHost/module.nix
+++ b/MMDVMHost/module.nix
@@ -1,4 +1,4 @@
-{ lib, config, pkgs, mmdvm_host, ... }:
+{ lib, config, pkgs, mmdvm_host, mmdvm_firmware, ... }:
 with lib;
 let
   # Shorter name to access final settings a 
@@ -10,14 +10,36 @@ in
 
   options.services.mmdvm_host = {
     enable = mkEnableOption "MMDVMHost service";
-    package = mkOption {
+    
+    host_package = mkOption {
       default = mmdvm_host.x86_64-linux.default;
       type = types.package;
     };
+
+    firmware_package = mkOption {
+      default = mmdvm_firmware.x86_64-linux.default;
+      type = types.package;
+    };
+    
     user = mkOption {
       type = types.str;
       default = "afg";
     };
+
+    group = mkOption {
+      type = types.str;
+      default = "afg";
+    };
+
+    config-file = mkOption {
+      type = types.str;
+    };
+
+    usb-tty = mkOption {
+      type = types.str;
+      default = "/dev/ttyUSB0";
+    };
+
   };
 
 
@@ -25,7 +47,8 @@ in
     # List packages installed in system profile. To search, run:
     # $ nix search wget
     environment.systemPackages = [
-      cfg.package
+      pkgs.stm32flash
+      cfg.host_package
     ];
 
     systemd.services.mmdvm_host = {
@@ -36,13 +59,22 @@ in
       serviceConfig = {
         Type = "exec";
         User = cfg.user;
+        Group = cfg.group;
         Restart = "always";
         RestartSec = "3s";
-        StartLimitIntervalSec = "0";
         RuntimeDirectory = "MMDVMHost";
       };
       script = ''
-        exec ${cfg.package}/bin/MMDVMHost
+        if [ ! -e /var/lib/mmdvm/firmware-version ]; then
+          mkdir -p /var/lib/mmdvm
+          touch /var/lib/mmdvm/firmware-version
+        fi
+        if [ "${cfg.firmware_package}" != "$(cat /var/lib/mmdvm/firmware-version)" ]; then
+          ${pkgs.stm32flash}/bin/stm32flash -w ${cfg.firmware_package}/bin/mmdvm_f4.bin -i ',-dtr,-rts,dtr,,:-dtr,rts,dtr' ${cfg.usb-tty}
+          echo "{cfg.firmware_package}" > /var/lib/mmdvm/firmware-version
+        fi
+        
+        exec ${cfg.package}/bin/MMDVMHost ${cfg.config-file}
       '';
     };
   };
diff --git a/flake.nix b/flake.nix
index dc7ec58..2eebced 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,7 +21,10 @@
 
       nixosModules.MMDVMHost = { config, pkgs, ... }: {
         imports = [ ./MMDVMHost/module.nix ];
-        _module.args.mmdvm_host = self.packages.x86_64-linux.MMDVMHost;
+        _module.args = {
+          mmdvm_host = self.packages.x86_64-linux.MMDVMHost;
+          mmdvm_firmware = self.packages.x86_64-linux.MMDVMFirmware;
+        };
       };
     };
 }