diff --git a/meta-digi-dey/recipes-digi/dualboot/dualboot/update-firmware b/meta-digi-dey/recipes-digi/dualboot/dualboot/update-firmware
index 2fd76f9b8..4fbabc52a 100755
--- a/meta-digi-dey/recipes-digi/dualboot/dualboot/update-firmware
+++ b/meta-digi-dey/recipes-digi/dualboot/dualboot/update-firmware
@@ -173,7 +173,11 @@ update_emmc() {
 	echo ""
 
 	# Execute the update.
-	swupdate ${VERBOSE} -i "${UPDATE_FILE}" -e "${IMAGE_SET}"
+	if [ -f "${PUBLIC_KEY}" ]; then
+		swupdate ${VERBOSE} -i "${UPDATE_FILE}" -e "${IMAGE_SET}" -k "${PUBLIC_KEY}"
+	else
+		swupdate ${VERBOSE} -i "${UPDATE_FILE}" -e "${IMAGE_SET}"
+	fi
 }
 
 update_nand() {