To elaborate somewhat on
ocicat's comments, related to upgrades vs. installs. I have two points to make:
Point 1:
There are no supported downgrade procedures. The only supported upgrade process is from older to newer, either sequentially by release or (with care, per the
Following -current FAQ) from from the most recent -release to -current. If you install -current now, it will be of diagnostic value, but you will not be able to downgrade to 5.4-release at the end of this month. If you wish to return to -release, you'll need to reinstall.
Point 2:
There was a major change to the -current kernel in August for internal time representation. Upgrading through this change to -current, from 5.3-release or from prior -current levels, is
more complex than a typical OpenBSD upgrade. A reinstall may be preferred by some new users.
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(The -stable branch of OpenBSD is functionally equivalent to -release for the above discussion points.)