Added a rm -rf /overlay/* before upgrade system to be sure it removes all jffs fies

packages/qmp-small-node/files/etc/qmp/qmp_update.sh

@@ -152,6 +152,7 @@ qmp_update_upgrade_system() {
 
 	read -p "Do you want to upgrade system using image $image_url? [N,y] " a
 	if [ "$a" == "y" ]; then
+		rm -rf /overlay/* 2>/dev/null
 		[ -n "$config" ] && sysupgrade -f $config $output_image
 		[ -z "$config" ] && sysupgrade -n $output_image
 	fi