18.06.3 how is it going? --> 18.06.4 --> 19.07 coming soon

If you are desiring updated firmware, master and snapshots are always available.

The sysupgrade from master now can automatically create a list of self-installed packages to make re-flashing a new snapshot a lot easier.

If you really insist on sticking with a given snapshot rather than simply flashing a new one, see