diff --git a/flake.nix b/flake.nix
index c8966ff..85db420 100644
--- a/flake.nix
+++ b/flake.nix
@@ -213,10 +213,10 @@
           pi4 = {
             modules = with inputs; [
               disko.nixosModules.disko
-              nixos-raspberrypi.nixosModules.raspberry-pi-4.base
-              nixos-raspberrypi.nixosModules.raspberry-pi-4.display-vc4
-              nixos-raspberrypi.nixosModules.nixpkgs-rpi
-              nixos-raspberrypi.nixosModules.trusted-nix-caches
+              # nixos-raspberrypi.nixosModules.raspberry-pi-4.base
+              # nixos-raspberrypi.nixosModules.raspberry-pi-4.display-vc4
+              # nixos-raspberrypi.nixosModules.nixpkgs-rpi
+              # nixos-raspberrypi.nixosModules.trusted-nix-caches
               # nixos-raspberrypi.lib.inject-overlays
               # nixos-raspberrypi.lib.inject-overlays-global
             ];
diff --git a/modules/nixos/hardware/raspberry-pi/default.nix b/modules/nixos/hardware/raspberry-pi/default.nix
index 4f66fb6..712031e 100644
--- a/modules/nixos/hardware/raspberry-pi/default.nix
+++ b/modules/nixos/hardware/raspberry-pi/default.nix
@@ -68,7 +68,7 @@ let
   };
   ubootBuilder = import ./uboot-builder.nix {
     inherit pkgs;
-    ubootPackage = pkgs.${namespace}.uboot-pi5;
+    ubootPackage = (if (cfg.variant == "5") then pkgs.${namespace}.uboot-pi5 else pkgs.${namespace}.uboot-pi4);
     firmwareBuilder = firmwarePopulateCmd;
     extlinuxConfBuilder = config.boot.loader.generic-extlinux-compatible.populateCmd;
   };
@@ -93,7 +93,7 @@ let
   populateUbootBuilder = import ./uboot-builder.nix {
     inherit ubootBinName;
     pkgs = pkgs.buildPackages;
-    ubootPackage = pkgs.${namespace}.uboot-pi5;
+    ubootPackage = (if (cfg.variant == "5") then pkgs.${namespace}.uboot-pi5 else pkgs.${namespace}.uboot-pi4);
     firmwareBuilder = firmwarePopulateCmd;
     extlinuxConfBuilder = config.boot.loader.generic-extlinux-compatible.populateCmd;
   };
@@ -167,7 +167,7 @@ in
       loader = {
         generic-extlinux-compatible = {
           enable = lib.mkDefault true;
-          useGenerationDeviceTree = true;
+          useGenerationDeviceTree = lib.mkOverride 60 true;
         };
         grub.enable = lib.mkForce false;
       };
@@ -214,7 +214,7 @@ in
               /plugin/;
 
               / {
-                compatible = "raspberrypi,4-model-b";
+                compatible = "brcm,bcm2711";
 
                 fragment@0 {
                   target-path = "/";
@@ -227,24 +227,24 @@ in
               };
             '';
           }
-          {
-            name = "enable-xhci";
-            dtsText = ''
-              /dts-v1/;
-              /plugin/;
+          # {
+          #   name = "enable-xhci";
+          #   dtsText = ''
+          #     /dts-v1/;
+          #     /plugin/;
 
-              / {
-                compatible = "brcm,bcm2711";
-                fragment@0 {
-                  //target-path = "/scb/xhci@7e9c0000";
-                  target = <&xhci>;
-                  __overlay__ {
-                    status = "okay";
-                  };
-                };
-              };
-            '';
-          }
+          #     / {
+          #       compatible = "brcm,bcm2711";
+          #       fragment@0 {
+          #         //target-path = "/scb/xhci@7e9c0000";
+          #         target = <&xhci>;
+          #         __overlay__ {
+          #           status = "okay";
+          #         };
+          #       };
+          #     };
+          #   '';
+          # }
         ] else
         [
           {
diff --git a/modules/nixos/hardware/raspberry-pi/firmware-builder.sh b/modules/nixos/hardware/raspberry-pi/firmware-builder.sh
index 5747ff2..31cdd29 100644
--- a/modules/nixos/hardware/raspberry-pi/firmware-builder.sh
+++ b/modules/nixos/hardware/raspberry-pi/firmware-builder.sh
@@ -39,7 +39,7 @@ dtb_path=$SRC_FIRMWARE_DIR
 echo "copying firmware..."
 
 # Device Tree
-
+useVendorDeviceTree=1
 if [ -n "$useVendorDeviceTree" ]; then
     echo -n "using vendor firmware from "
     dtb_path=$SRC_FIRMWARE_DIR
@@ -50,6 +50,7 @@ fi
 echo $dtb_path
 
 DTBS=("$dtb_path"/*.dtb)
+echo "dtbs all: $DTBS"
 for dtb in "${DTBS[@]}"; do
 # for dtb in $dtb_path/broadcom/*.dtb; do
     dst="$target/$(basename $dtb)"
diff --git a/modules/nixos/hardware/raspberry-pi/generational/install-device-tree.sh b/modules/nixos/hardware/raspberry-pi/generational/install-device-tree.sh
index 9a76e2c..d3d46b0 100644
--- a/modules/nixos/hardware/raspberry-pi/generational/install-device-tree.sh
+++ b/modules/nixos/hardware/raspberry-pi/generational/install-device-tree.sh
@@ -53,8 +53,10 @@ echo "$dtb_path"
 # firmware package has dtbs in its root,
 # dtbs built with kernel are in broadcom/
 DTBS=("$dtb_path"/*.dtb "$dtb_path"/broadcom/*.dtb)
+echo "all dtbs: $DTBS"
 for dtb in "${DTBS[@]}"; do
     dst="$target/$(basename "$dtb")"
+    echo "$dtb"
     copyForced "$dtb" "$dst"
     filesCopied[$dst]=1
 done
diff --git a/overlays/linux-cachyos/default.nix b/overlays/linux-cachyos/default.nix
index bb49b62..08d4278 100644
--- a/overlays/linux-cachyos/default.nix
+++ b/overlays/linux-cachyos/default.nix
@@ -36,5 +36,6 @@ in
     linuxPackages_cachyos-rc-lto-znver4 = cachyosPackages.cachyos-rc-lto-znver4;
 
     uboot-pi5 = ubootPackages.ubootRaspberryPi5;
+    uboot-pi4 = ubootPackages.ubootRaspberryPi4;
   };
 }
diff --git a/systems/aarch64-linux/pi4/boot.nix b/systems/aarch64-linux/pi4/boot.nix
index 40c7a4c..21c4689 100755
--- a/systems/aarch64-linux/pi4/boot.nix
+++ b/systems/aarch64-linux/pi4/boot.nix
@@ -1,22 +1,24 @@
 {
   pkgs,
   lib,
+  namespace,
   ...
 }:
 let
-  kernelBundle = pkgs.linuxAndFirmware.latest;
+  # kernelBundle = pkgs.linuxAndFirmware.latest;
 in
 {
   boot = {
-    loader.raspberry-pi = {
-      firmwarePackage = kernelBundle.raspberrypifw;
-      variant = "4";
-    };
-    kernelPackages = kernelBundle.linuxPackages_rpi4;
+  #   loader.raspberry-pi = {
+  #     firmwarePackage = kernelBundle.raspberrypifw;
+  #     variant = "4";
+  #   };
+  #   kernelPackages = kernelBundle.linuxPackages_rpi4;
+    kernelPackages = pkgs.${namespace}.linuxPackages_rpi4;
     supportedFilesystems = lib.mkForce [ ];
   };
 
-  hardware.raspberry-pi.config = {
+  ${namespace}.hardware.raspberry-pi.config = {
     all = {
       # [all] conditional filter, https://www.raspberrypi.com/documentation/computers/config_txt.html#conditional-filters