I acquired an o3DS with sysNAND 10.7. It already had A9LH and Luma3DS 5.4 set up, but not EmuNAND. I followed this guide...
https://gbatemp.net/threads/tutorial-setting-up-9-0-9-2-n3ds-xl-for-cfw-including-emunand-coldboot-cia-installer.405589/
... to set up EmuNAND on a new SD card and got to...
Prophets modified download has expired, or you deleted it. Can you post it again, because i cant find it? I somehow managed to make Trucha work, but i dont know how i did it. For all those who get 'Error decrypting data', its possible to fix it.