On an interesting note, I was able to boot loopy's firmware.nds on my N-Card! For some reason once back in the DS firmware, the DS won't detect the N-card and will show as nothing inserted (don't worry, this only affects the nds file, restarting int the real DS firmware menu, the N-Card still shows up).
But thats not what was interesting for me. I was able to boot a GBA game! (no ,I DID NOT boot a GBA ROM! I had a GBA GAME CARTRIDGE inserted) using this. It booted the DS into GBA mode when I had my pac-man game inserted.
No this won't let you run GBA games from slot-1. This merely tells the DS to boot the GBA slot, nothing more. You'll still need a slot-2 device. So this is still quite usefull if you want to use this to boot your EZFlash 3in1 (if you have a rom in NOR ram, otherwise it won't start it). Now when I do get a slot-2 flash-cart, I can boot it from my N-Card. Yes GBAexploder can do that too, but whenver I feel like just booting the GBA slot without resetting my DS, I can now just use that. Plus I can use it to make settings changes and such.
Loopy's firmware seems to be set to auto boot the GBA slot if there is a gba game/gba bootable slot-2 device inserted. Yay for convenience!
I see no reason why this won't work on other flashcarts as well. So you could put this on a R4/M3/other and use this to get back to your DS menu!
Also, I was able to dump my DS's firmware, but I got a couple of .rom files and .bin file. Sure these will work with some DS emulators, but I want to be able to use the DS's original firmware in the form of an NDS file to boot from my slot-1 flashcart. But alas, I'm stuck with Loopy's version.