Sorry I missed the original reply.
The bios dumpers I linked above are your best bet but the files you want are called ndsbios7.rom and ndsbios9.rom as they are the bios it would be questionable to link to them, a few itereations and I was staring a link.
Put the bios files and the firmware (called firmware.bin if memory serves) into the same directory as the emu.
eNDryptS is a dos program but you simply have to double click it with the roms you want in the same directory and press 1. Your DS roms in the same directory will be encrypted and you can try and run them.
All should be dibe