should u not check for QA flag first, because it was already downgraded? or never above 3.55, the last one u can safely update to kmeaw(rogero+spoof) do it via recovery
if the console was downgraded from 3.56++ and the guy u bought it from only putted rogero3.2(wich is safe for downgrade) on it, u cannot go straight to "kmeaw",rogero 3.4 is save to use as u noticed...
if downgraded! first qaflag it ( http://www.ps3devwiki.com/files/flash/Tools/toggle-qa/
) or if already installed/qaflagged, check with the button combo(L1,2,R1,2,d-pad down+L3) all pushed at the same time on settings "network settings"
once it is qa flagged, install OFW3.55 via recovery, then install again ur favorit 355CFW
if the console isn't downgraded..meaning never above 355, forget all of it and just install "kmeaw"