you need to delete your current version of .ff viewer off of your computer and download this one because the newer version of .ff viewer does not work properly and this one i got yesterday works very well
link:
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and also don't update this version.
you need to convert your ps3 patch to a xbox patch and it will likely rename it to like ps3-to-xbox-patch_mp.ff and just erase the ps3-to-xbox- and open up the patch in the new(old version) of .ff viewer that you downloaded above. then when your are done editing it convert the patch back to a ps3 patch and it will save this time as xbox-to-ps3-patch_mp.ff and erase the same stuff and put the patch on your ps3.
i recconmend you use the buc shotz converter
here:
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un-zip it to your desktop.