I've had this current MiSTer for a couple of years now, and I've even successfully rebuilt the SD card when I got a bigger one.
Then I grabbed a MiSTer Multisystem from RMC, but I didn't have a DE10 Nano for it, so I had scavenged it from my OG, and started using the 1TB MicroSD card on it. No Problems.
I've recently gotten a 2nd DE10 Nano and put my original back together. Built a card with Mr Fusion like before, but nothing would run. So I bought another MicroSD and rebuilt that, still nothing. The menus all work, and I got Wifi running, but the only thing that I've gotten to work is Time Pilot. No Console cores will run games or even boot all the way (No PlayStation splash screen or instance)
When I had issues like this in the past, it usually seemed like an .ini setting, but I don't see anything.
Any ideas?