Everyone seems to say (to those upgrading from 1.5) to upgrade to 3.52M33, then 3.52M33-4 then the latest.
I would assume its the same for people on lower CFW versions as once your running 3.52M33-4 its the same setup whether you came from 1.5 or a lower CFW.
I would go that way to be safe, you can download all the needed versions of the CFW here: http://www.dark-alex.org/.
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