ok, tip of the day..
the grexx outperformed my mediator back when my mediator was new, now i dont know!
but my grexx melted!!!! after 12 hours! or so..
(why i bought an mediator)
anyway revision 0 normally NEVER works with grexx, but i have heard a few stating it worked, so you might be in luck.
Amiga.FR might be able to help u on the upgrade, but i would NEVER send the card to DCE!! and i mean NEVER!
good luck