diff --git a/iso/builder/build.sh b/iso/builder/build.sh
index e8579d7..91e17cd 100755
--- a/iso/builder/build.sh
+++ b/iso/builder/build.sh
@@ -876,6 +876,26 @@ copy_file_to_fat_image() {
     mcopy -o -i "$img" "$src" "$dst" >/dev/null
 }
 
+grow_efi_grub_fat_image() {
+    img="$1"
+    tmpdir="$(mktemp -d)"
+    newimg="$(mktemp "${img##*/}.XXXXXX")"
+
+    current_size="$(wc -c < "$img" | tr -d '[:space:]')"
+    [ -n "$current_size" ] || current_size=0
+    extra_bytes=$((2 * 1024 * 1024))
+    new_size=$((current_size + extra_bytes))
+
+    # Recreate the FAT image with extra headroom and copy the original payload
+    # back in before injecting the larger GRUB theme assets.
+    mcopy -s -i "$img" :: "$tmpdir" >/dev/null
+    truncate -s "$new_size" "$newimg"
+    mformat -i "$newimg" -F :: >/dev/null
+    mcopy -s -i "$newimg" "$tmpdir"/* :: >/dev/null
+    mv "$newimg" "$img"
+    rm -rf "$tmpdir"
+}
+
 sync_efi_grub_theme_assets() {
     lb_dir="$1"
     found=0
@@ -886,11 +906,17 @@ sync_efi_grub_theme_assets() {
         fi
         found=1
         echo "bootloader sync: patching EFI GRUB image $img"
+        grow_efi_grub_fat_image "$img"
         mmd -i "$img" "::/boot" >/dev/null 2>&1 || true
         mmd -i "$img" "::/boot/grub" >/dev/null 2>&1 || true
+        mmd -i "$img" "::/boot/grub/live-theme" >/dev/null 2>&1 || true
 
         copy_file_to_fat_image "$img" "${BUILDER_DIR}/config/bootloaders/grub-efi/config.cfg" "::/boot/grub/config.cfg"
         copy_file_to_fat_image "$img" "${BUILDER_DIR}/config/bootloaders/grub-efi/theme.cfg" "::/boot/grub/theme.cfg"
+        for asset in "${BUILDER_DIR}"/config/bootloaders/grub-efi/live-theme/*; do
+            [ -f "$asset" ] || continue
+            copy_file_to_fat_image "$img" "$asset" "::/boot/grub/live-theme/"
+        done
 
         fat_image_has_file "$img" "::/boot/grub/config.cfg" || {
             echo "ERROR: EFI GRUB image missing /boot/grub/config.cfg after sync: $img" >&2
@@ -900,6 +926,14 @@ sync_efi_grub_theme_assets() {
             echo "ERROR: EFI GRUB image missing /boot/grub/theme.cfg after sync: $img" >&2
             exit 1
         }
+        fat_image_has_file "$img" "::/boot/grub/live-theme/theme.txt" || {
+            echo "ERROR: EFI GRUB image missing /boot/grub/live-theme/theme.txt after sync: $img" >&2
+            exit 1
+        }
+        fat_image_has_file "$img" "::/boot/grub/live-theme/bee-logo.tga" || {
+            echo "ERROR: EFI GRUB image missing /boot/grub/live-theme/bee-logo.tga after sync: $img" >&2
+            exit 1
+        }
     done
 
     if [ "$found" != "1" ]; then