follow my guide on page 16 and use v1.61 of the tool not the new ones. i had fits using v1.71 on my new 2dsxl with a 400gb micro sd card. until i used v1.61 and BAM!!!! worked on first try
i got all 4 emunands on all 4 of my 3DS's follow the guide and don't skip a step
because of b9s i think i had to use godmode9 v1.4.3 to create the proper emunands sorry