You have to patch it with FireRed German (Feuerrot) as above said. maybe this is your problem.I also get the black screen. I pathed it with two different programs onto a fire red rom, and tried opening it with two different emus. Couldn't get it to work :(
Are you sure?
Have you patched on a BPRD 1.0 ROM? It's a german firered 1.0 ROM.
That's the ROM which is hacked, and so you have to patch on it.
I like the screens,and i can't get an IPS file to work with me. Is there any way you could turn it into an .Gba or different format?