diff --git a/generate_boot_bins.sh b/generate_boot_bins.sh
old mode 100644
new mode 100755
index ca2c1ca..8c4be2c
--- a/generate_boot_bins.sh
+++ b/generate_boot_bins.sh
@@ -6,7 +6,7 @@ BOOTIMG_EXTRA_SPACE="512"
 MKFSVFAT_EXTRAOPTS="-S 512"
 
 show_help() {
-    echo "Usage: generate_boot_bins.sh [command] [options]"
+    echo "Usage: generate_boot_bins.sh [global options] [command] [options]"
     echo ""
     echo "Commands:"
     echo "  efi       Generate EFI image"
@@ -14,6 +14,9 @@ show_help() {
     echo "  fatimg    Generate FAT image"
     echo "  help      Show this help message"
     echo ""
+    echo "Global options:"
+    echo "  --sector-size BYTES    Set logical sector size passed to mkfs.vfat (default: 512)"
+    echo ""
     echo "efi command options:"
     echo "  --ramdisk PATH         Path to the ramdisk file"
     echo "  --systemd-boot PATH    Path to the systemd boot"
@@ -82,7 +85,7 @@ generate_efi_image() {
         case $1 in
             --ramdisk) RAMDISK="$2"; shift ;;
             --systemd-boot) SYSTEMD_BOOT="$2"; shift ;;
-			--stub) STUB="$2"; shift ;;
+            --stub) STUB="$2"; shift ;;
             --linux) LINUX_IMAGE="$2"; shift ;;
             --devicetree) DTB="$2"; shift ;;
             --cmdline) KERNEL_VENDOR_CMDLINE="$2"; shift ;;
@@ -201,6 +204,19 @@ generate_fat_image() {
     generate_bin "${INPUT_DIR}" "${OUTPUT_PATH}"
 }
 
+# ------------------------------------------------------------
+# Minimal addition: parse global --sector-size before command
+# ------------------------------------------------------------
+if [[ "$1" == "--sector-size" ]]; then
+    if [[ -n "$2" ]]; then
+        MKFSVFAT_EXTRAOPTS="-S $2"
+        shift 2
+    else
+        echo "Error: --sector-size requires a value (e.g., 512)"
+        exit 1
+    fi
+fi
+
 # Main script logic
 if [[ "$1" == "efi" ]]; then
     shift
@@ -211,7 +227,7 @@ elif [[ "$1" == "dtb" ]]; then
 elif [[ "$1" == "bin" ]]; then
     shift
     generate_fat_image "$@"
-elif [[ "$1" == "--help" ]]; then
+elif [[ "$1" == "--help" || "$1" == "help" ]]; then
     show_help
 else
     echo "Unknown command: $1"
diff --git a/make_fitimage.sh b/make_fitimage.sh
old mode 100644
new mode 100755
index e6ec115..4bbf33f
--- a/make_fitimage.sh
+++ b/make_fitimage.sh
@@ -4,19 +4,22 @@
 # make_fitimage.sh - FIT image packaging script for Qualcomm Linux development
 #
 # Usage:
-#   ./make_fitimage.sh --dtb <metadata_dts> --its <fitimage_its> [--kob <kernel_build_artifacts>] [--output <output_dir>]
+#   ./make_fitimage.sh --metadata <metadata_dts> --its <fitimage_its> \
+#       [--kobj <kernel_build_artifacts>] [--output <output_dir>] \
+#       [--sector-size <bytes>]
 #
 # Options:
-#   --metadata  Path to metadata DTS file (mandatory)
-#   --its       Path to FIT image ITS file (mandatory)
-#   --kobj      Path to kernel build artifacts directory (default: ../kobj)
-#   --output    Output directory for generated FIT image (default: ../images)
-#   --help      Show this help message and exit
+#   --metadata     Path to metadata DTS file (default: ../artifacts/qcom-dtb-metadata/qcom-metadata.dts)
+#   --its          Path to FIT image ITS file (default: ../artifacts/qcom-dtb-metadata/qcom-fitimage.its)
+#   --kobj         Path to kernel build artifacts directory (default: ../kobj)
+#   --output       Output directory for generated FIT image (default: ../images)
+#   --sector-size  Logical sector size passed to mkfs.vfat via helper script (default: 512)
+#   --help         Show this help message and exit
 #
 # Description:
 #   This script generates a FIT image using Qualcomm metadata and ITS files.
 #   It compiles the metadata DTS to DTB, creates the FIT image using mkimage,
-#   and packages the final image using generate_boot_bins.sh
+#   and packages the final image using generate_boot_bins.sh.
 ###############################################################################
 
 set -e
@@ -27,6 +30,9 @@ OUTPUT_DIR="../images"
 METADATA_DTS_PATH="../artifacts/qcom-dtb-metadata/qcom-metadata.dts"
 FIT_IMAGE_ITS_PATH="../artifacts/qcom-dtb-metadata/qcom-fitimage.its"
 
+# Default sector size (passed to generate_boot_bins.sh as global option)
+SECTOR_SIZE="512"
+
 # Help message
 function show_help() {
     cat <<EOF
@@ -34,11 +40,12 @@ Usage:
   ./make_fitimage.sh [OPTIONS]
 
 Options:
-  --metadata <path>  Path to metadata DTS file (default: $METADATA_DTS_PATH)
-  --its <path>       Path to FIT image ITS file (default: $FIT_IMAGE_ITS_PATH)
-  --kobj <path>      Path to kernel build artifacts directory (default: $KERNEL_BUILD_ARTIFACTS)
-  --output <path>    Output directory for generated FIT image (default: $OUTPUT_DIR)
-  --help             Show this help message and exit
+  --metadata <path>     Path to metadata DTS file (default: $METADATA_DTS_PATH)
+  --its <path>          Path to FIT image ITS file (default: $FIT_IMAGE_ITS_PATH)
+  --kobj <path>         Path to kernel build artifacts directory (default: $KERNEL_BUILD_ARTIFACTS)
+  --output <path>       Output directory for generated FIT image (default: $OUTPUT_DIR)
+  --sector-size <bytes> Logical sector size for FAT image packaging (default: $SECTOR_SIZE)
+  --help                Show this help message and exit
 
 Description:
   This script generates a FIT image using Qualcomm metadata and ITS files.
@@ -54,11 +61,21 @@ while [[ $# -gt 0 ]]; do
         --metadata) METADATA_DTS_PATH="$2"; shift 2 ;;
         --its) FIT_IMAGE_ITS_PATH="$2"; shift 2 ;;
         --output) OUTPUT_DIR="$2"; shift 2 ;;
+        --sector-size) SECTOR_SIZE="$2"; shift 2 ;;
         --help) show_help; exit 0 ;;
         *) echo "Unknown option: $1"; exit 1 ;;
     esac
 done
 
+# ---------------- Install prerequisites (root, Debian/Ubuntu only) ------------
+if command -v apt-get >/dev/null 2>&1; then
+    echo "Ensuring prerequisites are installed: device-tree-compiler, u-boot-tools"
+    export DEBIAN_FRONTEND=noninteractive
+    apt-get update -y
+    apt-get install -y device-tree-compiler u-boot-tools
+fi
+# -----------------------------------------------------------------------------
+
 # Resolve paths
 KERNEL_BUILD_ARTIFACTS="$(realpath "$KERNEL_BUILD_ARTIFACTS")"
 OUTPUT_DIR="$(realpath "$OUTPUT_DIR")"
@@ -68,7 +85,7 @@ FIT_IMAGE_ITS_PATH="$(realpath "$FIT_IMAGE_ITS_PATH")"
 # Function to create FIT image
 function create_fit_image() {
     # Cleaning previous FIT image artifacts
-    rm -f "${OUTPUT_DIR}/fit_dtb.bin"
+    rm -f "${OUTPUT_DIR}/dtb.bin"
     rm -rf "${OUTPUT_DIR}/fit_dir"
     rm -f "${KERNEL_BUILD_ARTIFACTS}/qcom-fitimage.its"
     rm -f "${KERNEL_BUILD_ARTIFACTS}/qcom-metadata.dtb"
@@ -79,16 +96,20 @@ function create_fit_image() {
     # Copying ITS file to kernel build artifacts path
     cp "$FIT_IMAGE_ITS_PATH" "$KERNEL_BUILD_ARTIFACTS/qcom-fitimage.its"
 
-    #Compiling metadata DTS to DTB
+    # Compiling metadata DTS to DTB
     dtc -I dts -O dtb -o "${KERNEL_BUILD_ARTIFACTS}/qcom-metadata.dtb" "${METADATA_DTS_PATH}"
 
     echo "Generating FIT image..."
     mkimage -f "${KERNEL_BUILD_ARTIFACTS}/qcom-fitimage.its" "${OUTPUT_DIR}/fit_dir/qclinux_fit.img" -E -B 8
 
-    echo "Packing final image into fit_dtb.bin..."
-    generate_boot_bins.sh bin --input "${OUTPUT_DIR}/fit_dir" --output "${OUTPUT_DIR}/fit_dtb.bin"
+    echo "Packing final image into dtb.bin..."
+    SELF_DIR="$(dirname "$(realpath "$0")")"
+
+    # Pass sector size to helper (global option). If SECTOR_SIZE is empty, default to 512 earlier.
+    "${SELF_DIR}/generate_boot_bins.sh" --sector-size "${SECTOR_SIZE}" bin \
+        --input "${OUTPUT_DIR}/fit_dir" --output "${OUTPUT_DIR}/dtb.bin"
 }
 
 echo "Starting FIT image creation..."
 create_fit_image
-echo "FIT image created at ${OUTPUT_DIR}/fit_dtb.bin"
+echo "FIT image created at ${OUTPUT_DIR}/dtb.bin"