B3313 0.9 & 1.0 fixed for Nintendo Switch!
The problem: Mupen looping ROM accesses every 64 MB. The B3313 0.9 ROM is 96 MB, meaning the wrong data is accessed 1/3 of the time, causing crashes.
The solution: Make it loop at 128 or 256 MB instead.
The true solution: just play a good version of B3313. Unabandoned A2AE is 48 MB in size, doesn't have such issues. It's even real hardware (yeah, N64) compatible, and thanks to those optimizations it should also lag less in an emulator on Switch (or a weak phone).
Now that 1.0 is out, and the dramafest seems to be dying out... here is the build:
https://files.chlorobyte.me/mupen/mup...
Replace the same named file at /retroarch/cores/ on your SD card.