diff --git a/packages/tools/installer/scripts/installer b/packages/tools/installer/scripts/installer
index d9f3d553b4..326d09d2e1 100755
--- a/packages/tools/installer/scripts/installer
+++ b/packages/tools/installer/scripts/installer
@@ -264,19 +264,23 @@ do_install_quick() {
         # configuring bootloader
         mkdir -p $TMPDIR/part1/EFI/BOOT
         msg_progress_install "80" "Setup bootloader with boot label = $DISKLABEL_SYSTEM and disk label = $DISKLABEL_STORAGE"
-        echo "DEFAULT linux" > $TMPDIR/part1/extlinux.conf
-        echo "PROMPT 0" >> $TMPDIR/part1/extlinux.conf
-        echo " " >> $TMPDIR/part1/extlinux.conf
-        echo "LABEL linux" >> $TMPDIR/part1/extlinux.conf
-        echo " KERNEL /KERNEL" >> $TMPDIR/part1/extlinux.conf
-        echo " APPEND boot=LABEL=$DISKLABEL_SYSTEM disk=LABEL=$DISKLABEL_STORAGE $EXTLINUX_PARAMETERS quiet" >> $TMPDIR/part1/extlinux.conf
-        echo "set timeout=\"0\"" > $TMPDIR/part1/EFI/BOOT/grub.cfg
-        echo "set default=\"LibreELEC\"" >> $TMPDIR/part1/EFI/BOOT/grub.cfg
-        echo "" >> $TMPDIR/part1/EFI/BOOT/grub.cfg
-        echo "menuentry \"LibreELEC\" {" >> $TMPDIR/part1/EFI/BOOT/grub.cfg
-        echo "	search --set -f /KERNEL" >> $TMPDIR/part1/EFI/BOOT/grub.cfg
-        echo "	linux /KERNEL boot=LABEL=$DISKLABEL_SYSTEM disk=LABEL=$DISKLABEL_STORAGE quiet" >> $TMPDIR/part1/EFI/BOOT/grub.cfg
-        echo "}" >> $TMPDIR/part1/EFI/BOOT/grub.cfg
+        cat << EOF > $TMPDIR/part1/extlinux.conf
+DEFAULT linux
+PROMPT 0
+
+LABEL linux
+ KERNEL /KERNEL
+ APPEND boot=LABEL=$DISKLABEL_SYSTEM disk=LABEL=$DISKLABEL_STORAGE $EXTLINUX_PARAMETERS quiet
+EOF
+        cat << EOF > $TMPDIR/part1/EFI/BOOT/grub.cfg
+set timeout="0"
+set default="LibreELEC"
+
+menuentry "LibreELEC" {
+	search --set -f /KERNEL
+	linux /KERNEL boot=LABEL=$DISKLABEL_SYSTEM disk=LABEL=$DISKLABEL_STORAGE quiet
+}
+EOF
         # uefi boot / hybrid mode
         if [ "$UEFI" = "1" ]; then
           mv $TMPDIR/part1/extlinux.conf $TMPDIR/part1/syslinux.cfg