Downgrade from 1.22 to 1.20?

From:	"Kimmo Jaskari" <kimmo dot jaskari at gmail dot com>
To:	m0n0wall at lists dot m0n0 dot ch
Subject:	Downgrade from 1.22 to 1.20?
Date:	Fri, 28 Apr 2006 00:30:02 +0300

My VPN is acting up and I can't find anything wrong. It worked fine
with 1.20, so I'm thinking downgrade for now.

I'm running with a CD/floppy version - can I just plonk in the 1.20 CD
in my firewall and reboot it? That is, can you downgrade that easily
or will I have to do a basic setup anew and then read in the backup
xml file?