Upgrading from AsteriskNOW 2.0.2

At some point I would like to upgrade an AsteriskNOW 2.0.2 server to the latest version. I have looked at the upgrade page and it states that the only officially supported upgrade is from AsteriskNOW 3.(something) and that releases earlier than that can not be upgraded, at least not by any officially supported means. I’m just trying to find out how to upgrade by some UNofficial means so that I don’t have to completely rebuild a 200±number PBX from scratch.