I think its just the rom
Sword of Sodan
I just dont think it works on Dingoo, tried both native emu, Picodrive Dingux.
tried rom from various sources, inc .gen and .bin renamed to smd and also converted to .smd and even tried smd rom from off the internet.
They all do the same, so i guess Sword of Sodan does not work?
Also tried on my other 2 Dingoos and the same.....
I guess only way is seeing if someone on this forum has actually tried and got Sword of Sodan to work.