Neogeo game stuck in service menu
Running into kind of an odd problem. RA Android (latest nightly), Metal Slug 2, FBNeo Core, a setup that has worked well for me many times. But on a new handheld I'm setting up, MS2 boots right into the service menu for some reason, and I can't seem to exit it. There are no prompts on any screen to exit, all I can do is cycle through the various tests with start. I have tried mapping a "diagnostic input" button combo in core options, but this does nothing. I've also tried other suggestions from threads I found, like connecting a keyboard and pressing tab, which also did nothing. I am also using the same rom that worked for me previously.
Oh, and I also tried loading an old mid-game savestate I had, and it starts playing the right music and sound effects, but no sprites load in-and then it goes right back to the service menu after a second.