For all who don't believe, this is how you ran into problems.
You may have you xbox chipped (--> YOU CAN NOT DO THIS FROM LEGAL POINT OF VIEW) and you may have started up your xbox with software from 'Slayer'/Evox. You may have done so on both boxes so indeed there is no pasv support on neather of those boxes.
Resolution
Start up one of those two boxes with XBMC and do this thing over again.
Things may work with this fantastic peace of software FLASHFXP. No special settings are needed.
So from legal point of view, the statement was true, for all others
This is not true
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