i would nail down exactly which motherboard version you own first, before doing anything with cfw.
you got the date code - so that is one way of finding out the m/b version.
the ofw being 3.93 is certainly promising.
different motherboards have different implications for running homebrew on a cfw. hacking the ta-088v3 motherboard (slim psp model) differs from hacking other slim models. some newer models (most newer brites and those later slim models) present more complications to running cfw than say the phat. all phats regardless of its ofw is hackable - that is an unique feature of the phats over all other psp models. most slims (generally) are hackable, as long as its ofw is equal or lower than ofw 5.03. most brites are troublesome in running full cfw...
i haven't played ffd on my phat/slim (both with cfw 5.00m33-6) but I have Little Big Planet. I haven't played much of it - but it works fine with my cfw...
the game itself and sony might strongly suggest that you require a ofw update to play - but can't you just play it anyway, without upgrading? just ignore that message.
personally, i wouldn't be in a hurry to upgrade the ofw past 5.03. the ofw 5.50 addressed the TIFF exploit required to run homebrew and thus the complications when doing these things like downgrading from the later (latest) ofw. i have heard of ppl downgrading from the latest ofw by using the pb and mms - but i would first determine whether my psp was capable of doing so.
there are so many implications depending on your particular psp and ofw. also, there are implications of whether to hack or not. for instance, psn access is restricted with my cfw - so if psn access is a big deal, then maybe stick to ofw. otherwise, you might do what you kinda suggested, use the cfw for homebrew and then downgrade/upgrade ofw to access PSN. bit of a hassle - but that's the way the sun shines.
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