diff --git a/contrib/gen-hybrid-uefi-bios-iso b/contrib/gen-hybrid-uefi-bios-iso
new file mode 100755
index 0000000..d7f4771
--- /dev/null
+++ b/contrib/gen-hybrid-uefi-bios-iso
@@ -0,0 +1,345 @@
+#!/usr/bin/python3
+"""
+Build hybrid BIOS/UEFI bootable ISO with GRUB and background image.
+"""
+
+import os
+import shutil
+import subprocess
+import sys
+import tempfile
+from os.path import abspath, exists, join
+
+
+class ISOBuilder:
+    """Builder for hybrid BIOS/UEFI bootable ISO with GRUB."""
+
+    def __init__(
+        self,
+        iso_dir: str,
+        output_iso: str,
+        volume_id: str ="TurnKey GNU/Linux",
+    ) -> None:
+        self.iso_dir = abspath(iso_dir)
+        self.output_iso = abspath(output_iso)
+        self.volume_id = volume_id
+        self.grub_dir = join(self.iso_dir, "boot", "grub")
+
+        # Validate paths
+        if not exists(self.iso_dir):
+            raise FileNotFoundError(f"ISO directory not found: {self.iso_dir}")
+
+    def create_directories(self) -> None:
+        """Create necessary directory structure."""
+        print("Creating directory structure...")
+        os.makedirs(self.grub_dir, exist_ok=True)
+        os.makedirs(join(self.iso_dir, "EFI", "boot"), exist_ok=True)
+
+    def copy_background_image(self) -> bool:
+        """Copy background image from isolinux directory."""
+        background_source = join(self.iso_dir, "isolinux", "splash.png")
+        background_dest = join(self.grub_dir, "background.png")
+
+        if exists(background_source):
+            print(f"Copying background image from {background_source}...")
+            shutil.copy2(background_source, background_dest)
+            return True
+        else:
+            print(
+                f"Warning: Background image not found at {background_source}",
+            )
+            return False
+
+    def create_grub_config(self) -> None:
+        """Create GRUB configuration file with background support."""
+        print("Creating GRUB configuration...")
+
+        grub_cfg = join(self.grub_dir, "grub.cfg")
+
+        config_content = """\
+set timeout=5
+set default=0
+
+# Load graphics modules
+if [ "${grub_platform}" == "efi" ]; then
+    insmod efi_gop
+    insmod efi_uga
+else
+    insmod vbe
+    insmod vga
+fi
+
+# Enable graphical terminal and load PNG support
+insmod gfxterm
+insmod png
+set gfxmode=auto
+terminal_output gfxterm
+
+# Set background image
+if background_image /boot/grub/background.png; then
+    set color_normal=light-gray/black
+    set color_highlight=white/blue
+    set menu_color_normal=light-gray/black
+    set menu_color_highlight=white/blue
+else
+    set color_normal=white/black
+    set color_highlight=black/light-gray
+fi
+
+menuentry "Live System" {
+    linux /live/vmlinuz boot=live quiet splash
+    initrd /live/initrd.img
+}
+
+menuentry "Install System" {
+    linux /live/vmlinuz boot=live quiet splash auto-installer
+    initrd /live/initrd.img
+}
+
+menuentry "Live System (Safe Mode)" {
+    linux /live/vmlinuz boot=live quiet splash nomodeset
+    initrd /live/initrd.img
+}
+"""
+        with open(grub_cfg, 'w') as fob:
+            fob.write(config_content)
+
+    def create_bios_boot_image(self) -> None:
+        """Create GRUB BIOS boot image."""
+        print("Creating GRUB BIOS boot image...")
+
+        bios_img = join(self.grub_dir, "bios.img")
+        core_img = join(self.grub_dir, "core.img")
+
+        # List of modules for BIOS boot
+        modules = [
+            "biosdisk", "iso9660", "part_gpt", "part_msdos",
+            "normal", "boot", "linux", "configfile", "search",
+            "search_fs_uuid", "search_fs_file", "loadenv",
+            "ls", "cat", "echo", "test", "true", "help", "gzio",
+            "png", "vbe", "vga", "gfxterm", "gfxterm_background"
+        ]
+
+        # Create core image
+        cmd = [
+            "grub-mkimage",
+            "--format=i386-pc",
+            f"--output={core_img}",
+            "--prefix=/boot/grub",
+            "--compression=auto",
+            *modules,
+        ]
+
+        subprocess.run(cmd, check=True)
+
+        # Combine boot.img and core.img
+        boot_img_source = "/usr/lib/grub/i386-pc/boot.img"
+
+        with open(bios_img, "wb") as out_file:
+            with open(boot_img_source, "rb") as boot_file:
+                out_file.write(boot_file.read())
+            with open(core_img, "rb") as core_file:
+                out_file.write(core_file.read())
+
+        # Clean up temporary core image
+        os.remove(core_img)
+
+        # Copy GRUB modules
+        grub_modules_dir = join(self.grub_dir, "i386-pc")
+        os.makedirs(grub_modules_dir, exist_ok=True)
+
+        source_modules = "/usr/lib/grub/i386-pc"
+        if exists(source_modules):
+            for pattern in ["*.mod", "*.lst"]:
+                import glob
+                for src_file in glob.glob(join(source_modules, pattern)):
+                    try:
+                        shutil.copy2(src_file, grub_modules_dir)
+                    except Exception:
+                        pass  # Ignore copy errors for individual modules
+
+    def create_efi_boot_image(self) -> None:
+        """Create GRUB EFI boot image."""
+        print("Creating GRUB EFI boot image...")
+
+        efi_img = join(self.grub_dir, "efi.img")
+
+        # Create FAT filesystem image
+        subprocess.run([
+            "dd",
+            "if=/dev/zero",
+            f"of={efi_img}",
+            "bs=1M",
+            "count=10"
+        ], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+        subprocess.run([
+            "mkfs.vfat",
+            efi_img
+        ], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+        # Mount EFI image
+        efi_mount = tempfile.mkdtemp()
+
+        try:
+            subprocess.run(
+                [
+                    "mount",
+                    "-o", "loop",
+                    efi_img,
+                    efi_mount
+                ],
+                check=True,
+            )
+
+            try:
+                # Create directory structure
+                efi_boot_dir = join(efi_mount, "EFI", "boot")
+                os.makedirs(efi_boot_dir, exist_ok=True)
+
+                # Copy background image into EFI image
+                grub_dir_in_efi = join(efi_mount, "boot", "grub")
+                os.makedirs(grub_dir_in_efi, exist_ok=True)
+
+                background_src = join(self.grub_dir, "background.png")
+                if exists(background_src):
+                    shutil.copy2(
+                        background_src,
+                        join(grub_dir_in_efi, "background.png"),
+                    )
+                grub_cfg = join(self.grub_dir, "grub.cfg")
+
+
+                # Create standalone GRUB EFI bootloader (64-bit)
+                subprocess.run(
+                    [
+                        "grub-mkstandalone",
+                        "--format=x86_64-efi",
+                        f"--output={join(efi_boot_dir, 'bootx64.efi')}",
+                        "--locales=",
+                        "--fonts=",
+                        f"boot/grub/grub.cfg={grub_cfg}",
+                    ],
+                    check=True,
+                )
+
+                # Create standalone GRUB EFI bootloader (32-bit)
+                subprocess.run(
+                    [
+                        "grub-mkstandalone",
+                        "--format=i386-efi",
+                        f"--output={join(efi_boot_dir, 'bootia32.efi')}",
+                        "--locales=",
+                        "--fonts=",
+                        f"boot/grub/grub.cfg={grub_cfg}",
+                    ], check=True)
+
+            finally:
+                # Unmount EFI image
+                subprocess.run(["umount", efi_mount], check=True)
+
+        finally:
+            # Clean up temporary directory
+            os.rmdir(efi_mount)
+
+    def create_iso(self) -> None:
+        """Create the hybrid ISO using xorriso."""
+        print("Creating hybrid ISO with xorriso...")
+
+        cmd = [
+            "xorriso",
+            "-as", "mkisofs",
+            "-iso-level", "3",
+            "-full-iso9660-filenames",
+            "-volid", self.volume_id,
+            "-appid", "Custom Debian Installer",
+            "-publisher", "Your Organization",
+            "-preparer", "GRUB Hybrid Build Script",
+            # BIOS boot
+            "-eltorito-boot", "boot/grub/bios.img",
+            "-no-emul-boot",
+            "-boot-load-size", "4",
+            "-boot-info-table",
+            "--grub2-boot-info",
+            "--grub2-mbr", "/usr/lib/grub/i386-pc/boot_hybrid.img",
+            # UEFI boot
+            "-eltorito-alt-boot",
+            "-e", "boot/grub/efi.img",
+            "-no-emul-boot",
+            "-isohybrid-gpt-basdat",
+            # Output
+            "-output", self.output_iso,
+            self.iso_dir
+        ]
+
+        subprocess.run(cmd, check=True)
+
+    def build(self) -> None:
+        """Execute the complete build process."""
+        print("=" * 70)
+        print(
+            "Creating hybrid BIOS/UEFI bootable ISO with GRUB and background",
+        )
+        print("=" * 70)
+
+        self.create_directories()
+        self.copy_background_image()
+        self.create_grub_config()
+        self.create_bios_boot_image()
+        self.create_efi_boot_image()
+        self.create_iso()
+
+        divider = "=" * 70
+        print("\n" + divider)
+        print("- Hybrid BIOS/UEFI ISO created successfully!")
+        print(f"  Output: {self.output_iso}")
+        print(divider + "\n")
+        print("You can now:")
+        print(
+            f"  1. Write to USB:   dd if={self.output_iso}"
+            " of=/dev/sdX bs=4M status=progress",
+        )
+        print("  2. Test with QEMU:")
+        print(
+            f"    BIOS: qemu-system-x86_64 -cdrom {self.output_iso} -m 2048",
+        )
+        print(
+            "    UEFI: qemu-system-x86_64 -bios /usr/share/ovmf/OVMF.fd"
+            f" -cdrom {self.output_iso} -m 2048\n",
+        )
+
+
+def main() -> None:
+    """Main entry point."""
+    # Configuration
+    ISO_DIR = "iso_root"
+    OUTPUT_ISO = "custom-debian.iso"
+    VOLUME_ID = "CUSTOM_DEBIAN"
+
+    # Parse command line arguments (basic implementation)
+    if len(sys.argv) > 1:
+        ISO_DIR = sys.argv[1]
+    if len(sys.argv) > 2:
+        OUTPUT_ISO = sys.argv[2]
+    if len(sys.argv) > 3:
+        VOLUME_ID = sys.argv[3]
+
+    try:
+        builder = ISOBuilder(ISO_DIR, OUTPUT_ISO, VOLUME_ID)
+        builder.build()
+    except FileNotFoundError as e:
+        print(f"Error: {e}", file=sys.stderr)
+        sys.exit(1)
+    except subprocess.CalledProcessError as e:
+        print(f"Error: Command failed: {e.cmd}", file=sys.stderr)
+        sys.exit(1)
+    except KeyboardInterrupt:
+        print("\nBuild cancelled by user", file=sys.stderr)
+        sys.exit(130)
+    except Exception as e:
+        print(f"Error: {e}", file=sys.stderr)
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()