I found the solution for those that downgraded and get the black screen.
Go into your SD-card (on your PC) and rename your emunand folder (Nintendo 3DS/XXXXXXXXXX) to something else.
Now start your 3ds and boot into emunand. It will recreate the folder (but without your installs). This is fine.
Take out your SD-card and go back to your PC. Move all the files from your renamed emunand folder to the one that just got created EXCEPT FOR THOSE THAT CONFLICT. DO NOT MOVE THOSE. IT WILL NOT WORK.
Worked for me ^^