Not sure when this started because I just updated my mister after a few months away, but uni-bios no longer lets me get into the menu by holding abc, either holding each individual button or pressing the ABC macro. I've replaced the uni-bios in the roms folder with another copy and that didn't do anything.
Universe BIOS Cannot Get to Menu ABC Doesn’t Work
Re: Universe BIOS Cannot Get to Menu ABC Doesn’t Work
I fixed it by deleting neo-epo.sp1 and reinstalling it