Presumably if 5.12.4 is really bad for PW3, then Amazon ought to produce a special 5.12.3.1 or something that is recognised as an upgrade to 5.12.4 so the "victims" can go "back". There are reasons to do with databases why you might need a special version of an older FW to be able to go back, one that at install "understands" a later database and fixes up somehow so it will work with older FW.
So it doesn't surprise me that you can't load earlier FWs, unless there was a delete database and everything, an "ultimate" factory reset.
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