Boot up with the usb connected, holding start+select, it should go into the format menu, choose quick format and when it's finished it should then go straight into usb mode and connect up with your pc, allowing you to copy a xmenu.dat file over.
Lots of people think it's the game, but i can you it's not and play perfectly on even my oldie SC-CF. (check on-line vids, the top screen is not supposed to flash))
Try transfering the rom to the acekard ram.
@SylverReZ, I also heard one of the Prince of Persia games was so unfinished that it required the "24/7 online" drm so a puzzle could be done and the game could be finished. And that when the Ubisoft servers were closed the (cracked) game was impossible to finish or something like that
I like that games can be fixed after the fact, hate that it's being abused via beta tests... And DLC... I was a 7800 owner back in the day and loved Impossible Mission, turns out I couldn't beat it because it was actually impossible lol