What I experienced with emunand is: launching retroarch through R to access the homebrew launcher will result in a crash with the n64 core from m4xw.
However if I use the "Homebrew Menu Launcher Legal Nsp", I can then launch retroarch and the n64 core correctly.
I used your guide with great success when I made my 5.x and 6.x backup nand back then.
Today, I've downloaded everything again to have the updated files. I want to make a backup of my 7.0.1 nand but after I inject the payload, all that I'm getting is the kosmos screen followed by a text saying...
Hi
Thanks for this application, I just try with a disc who have Paper Mario Pal, Eyeshield21 NTSC-J, No more heroes NTSC-U on my Pal wii "soft" mod and all the game work
(excuse me for my bad english I'm french)