Mmm.. try with a nightly build from https://github.com/dimok789/loadiine_gx2/releases
Is your micro SD recognized by your Wii U?
Or you can test Loadiine GX2 Online option in loadiine.ovh
I have unlocked DLC in Sm4sh but i have problems with CSPs if i put any CSP in the backup game, it keeps on loading screen forever. Anyway, i can play with new characters without CSPs
I like that games can be fixed after the fact, hate that it's being abused via beta tests... And DLC... I was a 7800 owner back in the day and loved Impossible Mission, turns out I couldn't beat it because it was actually impossible lol