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From: Mike Clarke <mike@milibyte.co.uk>
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Cc: "Littlefield, Tyler" <tyler@tysdomain.com>
Date: Mon, 05 Jun 2017 10:03:07 +0100
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Subject: Re: various questions about booting and recovery
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On Monday 05 Jun 2017 00:03:45 Matthew Seaman wrote:
> However, so long as you're on 10.3 or above you can select which boot
> environment to boot into from the boot menu.  So if booting fails, just
> hit the reset button and choose a different boot environment to try again.

But this only works for boot environments which do not have any child 
datasets.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208601#c19

-- 
Mike Clarke