1. disable FTP commands from config.php
2. add to config.php
// Update core define( 'WP_AUTO_UPDATE_CORE', true );
optionally for Synology NAS
# reset chown for Synology user nobody
chown -R nobody:nobody /web/wordpress/dir
# reset files and folders chmod in /web/wordpress/dir
find . -type f -exec chmod 0644 {} \;
find . -type d -exec chmod 0755 {} \;