Don't think it'll work with any other Amiga than the A3000. :-?
As far as I know the 1.4 Rom was only released to the A3000. As I've been told it was there to load the kickstart 2.0 of the harddrive of an A3000 since the kickstart was... well... not done when the A3000 was sold? Anyway it does just that with my A3000 even though it's an kickstart3.1 image on my HD. ;-)