There is an update for DSM 6.2.4-25554 After running this update I noticed that RTM was no longer working. Checking inotify showed that inotify/max_user_watches has been reset to 8192, hence RTM not working. I have had to run the  echo 's2s_watches_max=262144' >> /etc/synoinfo.conf echo 's2s_watches_max=262144' >> /etc.defaults/synoinfo.conf commands again, manually, then reboot the NAS to successfully restore RTM