As I’m pretty new to the Dingoo scene, I was, until recently, unaware of the A320’s inability to play Mega Drive/ Genesis ROMs with the .BIN (or .MD) file extension(s). I have predicted that many users have had similar difficulties with their machines, and so I will post a helpful download link to a piece of rather useful file conversion software named SMD BIN Win:
Although the program does require a short installation prior to use, I have found it VERY easy to use, and recommend it to all emulation beginners.
NOTE: After the conversion of your ROMs, the program will place the converted files into its own folder. They can be located at: C (replace with the letter of you hard disk if required):/Program Files/CodeIsle/SMD BIN WIN/[ROM NAME].SMD