This is actually issue #5 (dead link) on my GitLab repo Rock Band 3 for Wii - Custom Songs. I'll repost the message here for easier diagnosis, but you can follow my progress on GitLab via the link.
I've never had official DLC, so I don't know what I'm doing wrong. I put the .bin files in the appropriate folder on my SD card, but when I try to load it in-game, it gives me a "Add-on content cannot be restored to the Wii System Memory" error. I have no idea what is causing this. Injecting the .app files into the real NAND works fine, but there's not enough room on the NAND for many more songs.
Last edited by HarveyHouston,
, Reason: Removed link