diff --git a/example.nix b/example.nix
index 248ebd6..c9d8aa2 100644
--- a/example.nix
+++ b/example.nix
@@ -1,34 +1,22 @@
 { pkgs ? import <nixpkgs> {}
 }:
-import ./builder.nix {
-  inherit pkgs;
-  target = "ath79";
-  profile = "ubnt_unifiac-lite";
-  packages = [
-    "tcpdump"
-    "vxlan" "kmod-vxlan"
-    "-ath10k-firmware-qca988x-ct" "ath10k-firmware-qca988x"
-    "-kmod-ath10k-ct" "kmod-ath10k"
-  ];
-  files = pkgs.runCommandNoCC "image-files" {} ''
-    mkdir -p $out/etc/uci-defaults
-    cat > $out/etc/uci-defaults/99-custom <<EOF
-    uci -q batch << EOI
-    set network.lan.ipaddr='192.168.178.1'
-    commit network
-    set wireless.@wifi-device[0].disabled='0'
-    set wireless.@wifi-iface[0].ssid='OpenWrt0815'
-    commit wireless
-    add dhcp host
-    set dhcp.@host[-1].name='bellerophon'
-    set dhcp.@host[-1].ip='192.168.2.100'
-    set dhcp.@host[-1].mac='a1:b2:c3:d4:e5:f6'
-    commit dhcp
-    rename firewall.@zone[0]='lan'
-    rename firewall.@zone[1]='wan'
-    rename firewall.@forwarding[0]='lan_wan'
-    commit firewall
-    EOI
-    EOF
-  '';
-}
+let
+  profiles = import ./profiles.nix { inherit pkgs; };
+in
+import ./builder.nix (
+  builtins.head (profiles.identifyProfile "avm_fritz7412") // {
+    packages = [
+      "tcpdump"
+      "vxlan" "kmod-vxlan"
+    ];
+    files = pkgs.runCommandNoCC "image-files" {} ''
+      mkdir -p $out/etc/uci-defaults
+      cat > $out/etc/uci-defaults/99-custom <<EOF
+      uci -q batch << EOI
+      set system.@system[0].hostname='testap'
+      commit
+      EOI
+      EOF
+    '';
+  }
+)
diff --git a/files.nix b/files.nix
index 1e6316e..c13b9b7 100644
--- a/files.nix
+++ b/files.nix
@@ -99,12 +99,18 @@ let
     ''
   ) feedsFiles;
 
-  arch = (builtins.fromJSON (
-    builtins.readFile (
-      variantFiles."profiles.json"
+  profiles =
+    if variantFiles ? "profiles.json"
+    then builtins.fromJSON (
+      builtins.readFile (
+        variantFiles."profiles.json"
+      )
     )
-  )).arch_packages;
+    else null;
+
+  arch = profiles.arch_packages;
 
 in {
   inherit variantFiles variantPackages feedsFiles feedsPackages;
+  inherit profiles arch;
 }
diff --git a/flake.nix b/flake.nix
index 124e300..f6a4821 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,6 +14,8 @@
         openwrt = if args ? openwrt then args.openwrt else openwrt;
       });
 
+    lib.profiles = import ./profiles.nix;
+
     # `nix run .#generate-hashes`
     packages.x86_64-linux.generate-hashes = import ./generate-hashes.nix {
       pkgs = nixpkgs.legacyPackages.x86_64-linux;
diff --git a/profiles.nix b/profiles.nix
new file mode 100644
index 0000000..ae89974
--- /dev/null
+++ b/profiles.nix
@@ -0,0 +1,35 @@
+{ pkgs ? import <nixpkgs> {}
+# OpenWRT release
+, release ? "21.02.3"
+}:
+with pkgs;
+let
+  hashes = import ./hashes/${release}.nix;
+in rec {
+  allProfiles =
+    builtins.mapAttrs (target: variants:
+      lib.filterAttrs (_: profiles:
+        profiles != null
+      ) (
+        builtins.mapAttrs (variant: h:
+          (import ./files.nix {
+            inherit pkgs release target variant;
+            inherit (h) sha256 feedsSha256;
+          }).profiles
+        ) variants
+      )
+    ) hashes;
+
+  # filters hardware profiles from all boards.json files
+  identifyProfile = profile:
+    builtins.concatMap (target:
+      map (variant: {
+        # match return value
+        inherit pkgs release target variant profile;
+      }) (
+        builtins.filter (variant:
+          allProfiles.${target}.${variant}.profiles ? ${profile}
+        ) (builtins.attrNames allProfiles.${target})
+      )
+    ) (builtins.attrNames allProfiles);
+}