works now

flake.nix

@@ -1,17 +1,23 @@
 {
-  description = "My NixOS system configuration";
+  description = "Impure NixOS flake for mobile02";
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
 
-  outputs = { self, nixpkgs, ... }@inputs:
-    {
-      nixosConfigurations.mobile02 = nixpkgs.lib.nixosSystem {
-        system = "x86_64-linux";
-        modules = [
-          ./configuration.nix
-          /etc/nixos/hardware-configuration.nix
-        ];
-      };
+  outputs = { self, nixpkgs }: let
+    system = "x86_64-linux";  # adjust if needed
+    hardwareConfig = import /etc/nixos/hardware-configuration.nix;
+  in
+  {
+    nixosConfigurations.mobile02 = nixpkgs.lib.nixosSystem {
+      inherit system;
+
+      modules = [
+        ./configuration.nix
+        hardwareConfig
+      ];
     };
+  };
 }