When I try to run any Dreamcast game with batocera on Go Advance I get a black screen and I end up in the game list again.
Bios files are checksum validated and available in share -> bios on the SD card.
Check your game files (file extension) and test games from other sources.
For me Dreamcast games on my OGA work fine
Manually upgrading to batocera-5.25-odroidgoa-20200314 seemed to do the trick, Dreamcast emulation is now running fine. Very cool :)