diff --git a/target/linux/realtek/base-files/lib/upgrade/upgrade_dualboot_plasmacloud.sh b/target/linux/realtek/base-files/lib/upgrade/upgrade_dualboot_plasmacloud.sh
new file mode 100644
index 0000000000..0f379952b3
--- /dev/null
+++ b/target/linux/realtek/base-files/lib/upgrade/upgrade_dualboot_plasmacloud.sh
@@ -0,0 +1,68 @@
+set_boot_part() {
+	local part_num="$1"
+	local setenv_script="/tmp/fw_env_upgrade"
+	local board=$(board_name)
+
+	case "$board" in
+	*)
+		echo "${board} is not supported for dual boot" 1>&2
+		return 1
+		;;
+	esac
+
+	# store u-boot env changes
+	mkdir -p /var/lock
+	cat $setenv_script
+	fw_setenv -s $setenv_script || {
+		echo "failed to update U-Boot environment"
+		return 1
+	}
+}
+
+platform_do_upgrade_dualboot_plasmacloud() {
+	local primary_firmware_mtd
+	local restore_backup
+	local next_boot_part
+	local tar_file="$1"
+	local inactive_mtd
+	local board_dir
+
+	inactive_mtd="$(find_mtd_index $PART_NAME)"
+	if [ -z "$inactive_mtd" ]; then
+		# Handle case when u-boot-env is not correctly written and we
+		# are running from initramfs. Only install it in the "firmware1"
+		# partition
+		PART_NAME=firmware1
+		inactive_mtd="$(find_mtd_index $PART_NAME)"
+	fi
+
+	if [ -z "$inactive_mtd" ]; then
+		echo "Cannot find \"firmware1\" nor \"${$PART_NAME}\" partition to work with. Abort!" 2>&1
+		return 1
+	fi
+
+	# identify "inactive" slot id based on the expected partition id
+	# of the primary ("firmware1") slot
+	case "$(board_name)" in
+	*)
+		echo "failed to detect primary firmware mtd partition for board" 2>&1
+		return 1
+		;;
+	esac
+
+	if [ "$inactive_mtd" = "$primary_firmware_mtd" ]; then
+		next_boot_part="1"
+	else
+		next_boot_part="2"
+	fi
+
+	[ -n "$UPGRADE_BACKUP" ] && restore_backup="${MTD_CONFIG_ARGS} -j ${UPGRADE_BACKUP}"
+
+	# write selected firmware slot
+	board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
+	board_dir=${board_dir%/}
+	tar -xf $tar_file ${board_dir}/kernel ${board_dir}/root -O | mtd $restore_backup write - $PART_NAME
+
+	# update u-boot-env to select new firmware slot
+	set_boot_part "$next_boot_part"
+}