If you can help me figure out the exact commit which broke emuNAND stuff (basically, get the very last official build from stfour, before I started making edits, see if it works there, and begin using my builds one by one from Github, there aren't that many), I'll see if I can fix it, if it's apparent what the problem is.
For me it's as follows:
4.7.4 - Works. Boots on emunand and can play games.
4.7.6 - 4.7.91 - Haven't tested as I was working backwards on your releases.
4.7.92 - Works. Boots on emunand and can play games.
4.7.93 - 4.7.96 - Will not boot on emunand.
Let me know if you want me to test the builds from 4.7.6 - 4.7.91.
Cheers