help patchin' f355 usa

[zxcv]

hi. i have a problem with f355 usa autoboot (echelon's release). i have a pal dreamcast and i'm not able to run this game at 60Hz. i have tried all the patches released, but the program tells me that the image size is incorrect and the patch can't be used. i have also tried with adrenalin patcher, but it doesn't work...tells that the image is already patched (??). can you help me, please? is there a way to play this game at 60 Hz? thank you